what's a face presentation

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Delivery, Face Presentation, and Brow Presentation: Understanding Fetal Positions and Birth Scenarios

Introduction:.

During childbirth, the position of the baby plays a significant role in the delivery process. While the most common fetal presentation is the head-down position (vertex presentation), variations can occur, such as face presentation and brow presentation. This comprehensive article aims to provide a thorough understanding of delivery, face presentation, and brow presentation, including their definitions, causes, complications, and management approaches.

Delivery Process:

• Normal Vertex Presentation: In a typical delivery, the baby is positioned head-down, with the back of the head (occiput) leading the way through the birth canal.
• Engagement and Descent: Prior to delivery, the baby's head engages in the pelvis and gradually descends, preparing for birth.
• Cardinal Movements: The baby undergoes a series of cardinal movements, including flexion, internal rotation, extension, external rotation, and restitution, which facilitate the passage through the birth canal.

Face Presentation:

• Definition: Face presentation occurs when the baby's face is positioned to lead the way through the birth canal instead of the vertex (head).
• Causes: Face presentation can occur due to factors such as abnormal fetal positioning, multiple pregnancies, uterine abnormalities, or maternal pelvic anatomy.
• Complications: Face presentation is associated with an increased risk of prolonged labor, difficulties in delivery, increased fetal malposition, birth injuries, and the need for instrumental delivery.
• Management: The management of face presentation depends on several factors, including the progression of labor, the size of the baby, and the expertise of the healthcare provider. Options may include closely monitoring the progress of labor, attempting a vaginal delivery with careful maneuvers, or considering a cesarean section if complications arise.

Brow Presentation:

• Definition: Brow presentation occurs when the baby's head is partially extended, causing the brow (forehead) to lead the way through the birth canal.
• Causes: Brow presentation may result from abnormal fetal positioning, poor engagement of the fetal head, or other factors that prevent full flexion or extension.
• Complications: Brow presentation is associated with a higher risk of prolonged labor, difficulty in descent, increased chances of fetal head entrapment, birth injuries, and the potential need for instrumental delivery or cesarean section.
• Management: The management of brow presentation depends on various factors, such as cervical dilation, progress of labor, fetal size, and the presence of complications. Close monitoring, expert assessment, and a multidisciplinary approach may be necessary to determine the safest delivery method, which can include vaginal delivery with careful maneuvers, instrumental assistance, or cesarean section if warranted.

Delivery Techniques and Intervention:

• Obstetric Maneuvers: In certain situations, skilled healthcare providers may use obstetric maneuvers, such as manual rotation or the use of forceps or vacuum extraction, to facilitate delivery, reposition the baby, or prevent complications.
• Cesarean Section: In cases where vaginal delivery is not possible or poses risks to the mother or baby, a cesarean section may be performed to ensure a safe delivery.

Conclusion:

Delivery, face presentation, and brow presentation are important aspects of childbirth that require careful management and consideration. Understanding the definitions, causes, complications, and appropriate management approaches associated with these fetal positions can help healthcare providers ensure safe and successful deliveries. Individualized care, close monitoring, and multidisciplinary collaboration are crucial in optimizing maternal and fetal outcomes during these unique delivery scenarios.

Hashtags: #Delivery #FacePresentation #BrowPresentation #Childbirth #ObstetricDelivery

On the Article

Krish Tangella MD, MBA

Alexander Enabnit

Alexandra Warren

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Face and Brow Presentation

• Author: Teresa Marino, MD; Chief Editor: Carl V Smith, MD  more...
• Sections Face and Brow Presentation
• Mechanism of Labor
• Labor Management

At the onset of labor, assessment of the fetal presentation with respect to the maternal birth canal is critical to the route of delivery. At term, the vast majority of fetuses present in the vertex presentation, where the fetal head is flexed so that the chin is in contact with the fetal thorax. The fetal spine typically lies along the longitudinal axis of the uterus. Nonvertex presentations (including breech, transverse lie, face, brow, and compound presentations) occur in less than 4% of fetuses at term. Malpresentation of the vertex presentation occurs if there is deflexion or extension of the fetal head leading to brow or face presentation, respectively.

In a face presentation, the fetal head and neck are hyperextended, causing the occiput to come in contact with the upper back of the fetus while lying in a longitudinal axis. The presenting portion of the fetus is the fetal face between the orbital ridges and the chin. The fetal chin (mentum) is the point designated for reference during an internal examination through the cervix. The occiput of a vertex is usually hard and has a smooth contour, while the face and brow tend to be more irregular and soft. Like the occiput, the mentum can present in any position relative to the maternal pelvis. For example, if the mentum presents in the left anterior quadrant of the maternal pelvis, it is designated as left mentum anterior (LMA).

In a brow presentation, the fetal head is midway between full flexion (vertex) and hyperextension (face) along a longitudinal axis. The presenting portion of the fetal head is between the orbital ridge and the anterior fontanel. The face and chin are not included. The frontal bones are the point of designation and can present (as with the occiput during a vertex delivery) in any position relative to the maternal pelvis. When the sagittal suture is transverse to the pelvic axis and the anterior fontanel is on the right maternal side, the fetus would be in the right frontotransverse position (RFT).

Face presentation occurs in 1 of every 600-800 live births, averaging about 0.2% of live births. Causative factors associated with a face presentation are similar to those leading to general malpresentation and those that prevent head flexion or favor extension. Possible etiology includes multiple gestations, grand multiparity, fetal malformations, prematurity, and cephalopelvic disproportion. At least one etiological factor may be identified in up to 90% of cases with face presentation.

Fetal anomalies such as hydrocephalus, anencephaly, and neck masses are common risk factors and may account for as many as 60% of cases of face presentation. For example, anencephaly is found in more than 30% of cases of face presentation. Fetal thyromegaly and neck masses also lead to extension of the fetal head.

A contracted pelvis or cephalopelvic disproportion, from either a small pelvis or a large fetus, occurs in 10-40% of cases. Multiparity or a large abdomen can cause decreased uterine tone, leading to natural extension of the fetal head.

Face presentation is diagnosed late in the first or second stage of labor by examination of a dilated cervix. On digital examination, the distinctive facial features of the nose, mouth, and chin, the malar bones, and particularly the orbital ridges can be palpated. This presentation can be confused with a breech presentation because the mouth may be confused with the anus and the malar bones or orbital ridges may be confused with the ischial tuberosities. The facial presentation has a triangular configuration of the mouth to the orbital ridges compared to the breech presentation of the anus and fetal genitalia. During Leopold maneuvers, diagnosis is very unlikely. Diagnosis can be confirmed by ultrasound evaluation, which reveals a hyperextended fetal neck. [ 1 , 2 ]

Brow presentation is the least common of all fetal presentations and the incidence varies from 1 in 500 deliveries to 1 in 1400 deliveries. Brow presentation may be encountered early in labor but is usually a transitional state and converts to a vertex presentation after the fetal neck flexes. Occasionally, further extension may occur resulting in a face presentation.

The causes of a persistent brow presentation are generally similar to those causing a face presentation and include cephalopelvic disproportion or pelvic contracture, increasing parity and prematurity. These are implicated in more than 60% of cases of persistent brow presentation. Premature rupture of membranes may precede brow presentation in as many as 27% of cases.

Diagnosis of a brow presentation can occasionally be made with abdominal palpation by Leopold maneuvers. A prominent occipital prominence is encountered along the fetal back, and the fetal chin is also palpable; however, the diagnosis of a brow presentation is usually confirmed by examination of a dilated cervix. The orbital ridge, eyes, nose, forehead, and anterior fontanelle are palpated. The mouth and chin are not palpable, thus excluding face presentation. Fetal ultrasound evaluation again notes a hyperextended neck.

As with face presentation, diagnosis is often made late in labor with half of cases occurring in the second stage of labor. The most common position is the mentum anterior, which occurs about twice as often as either transverse or posterior positions. A higher cesarean delivery rate occurs with a mentum transverse or posterior [ 3 ] position than with a mentum anterior position.

The mechanism of labor consists of the cardinal movements of engagement, descent, flexion, internal rotation, and the accessory movements of extension and external rotation. Intuitively, the cardinal movements of labor for a face presentation are not completely identical to those of a vertex presentation.

While descending into the pelvis, the natural contractile forces combined with the maternal pelvic architecture allow the fetal head to either flex or extend. In the vertex presentation, the vertex is flexed such that the chin rests on the fetal chest, allowing the suboccipitobregmatic diameter of approximately 9.5 cm to be the widest diameter through the maternal pelvis. This is the smallest of the diameters to negotiate the maternal pelvis. Following engagement in the face presentation, descent is made. The widest diameter of the fetal head negotiating the pelvis is the trachelobregmatic or submentobregmatic diameter, which is 10.2 cm (0.7 cm larger than the suboccipitobregmatic diameter). Because of this increased diameter, engagement does not occur until the face is at +2 station.

Fetuses with face presentation may initially begin labor in the brow position. Using x-ray pelvimetry in a series of 7 patients, Borrell and Ferstrom demonstrated that internal rotation occurs between the ischial spines and the ischial tuberosities, making the chin the presenting part, lower than in the vertex presentation. [ 4 , 5 ] Following internal rotation, the mentum is below the maternal symphysis, and delivery occurs by flexion of the fetal neck. As the face descends onto the perineum, the anterior fetal chin passes under the symphysis and flexion of the head occurs, making delivery possible with maternal expulsive forces.

The above mechanisms of labor in the term infant can occur only if the mentum is anterior and at term, only the mentum anterior face presentation is likely to deliver vaginally. If the mentum is posterior or transverse, the fetal neck is too short to span the length of the maternal sacrum and is already at the point of maximal extension. The head cannot deliver as it cannot extend any further through the symphysis and cesarean delivery is the safest route of delivery.

Fortunately, the mentum is anterior in over 60% of cases of face presentation, transverse in 10-12% of cases, and posterior only 20-25% of the time. Fetuses with the mentum transverse position usually rotate to the mentum anterior position, and 25-33% of fetuses with mentum posterior position rotate to a mentum anterior position. When the mentum is posterior, the neck, head and shoulders must enter the pelvis simultaneously, resulting in a diameter too large for the maternal pelvis to accommodate unless in the very preterm or small infant.

Three labor courses are possible when the fetal head engages in a brow presentation. The brow may convert to a vertex presentation, to a face presentation, or remain as a persistent brow presentation. More than 50% of brow presentations will convert to vertex or face presentation and labor courses are managed accordingly when spontaneous conversion occurs.

In the brow presentation, the occipitomental diameter, which is the largest diameter of the fetal head, is the presenting portion. Descent and internal rotation occur only with an adequate pelvis and if the face can fit under the pubic arch. While the head descends, it becomes wedged into the hollow of the sacrum. Downward pressure from uterine contractions and maternal expulsive forces may cause the mentum to extend anteriorly and low to present at the perineum as a mentum anterior face presentation.

If internal rotation does not occur, the occipitomental diameter, which measures 1.5 cm wider than the suboccipitobregmatic diameter and is thus the largest diameter of the fetal head, presents at the pelvic inlet. The head may engage but can descend only with significant molding. This molding and subsequent caput succedaneum over the forehead can become so extensive that identification of the brow by palpation is impossible late in labor. This may result in a missed diagnosis in a patient who presents later in active labor.

If the mentum is anterior and the forces of labor are directed toward the fetal occiput, flexing the head and pivoting the face under the pubic arch, there is conversion to a vertex occiput posterior position. If the occiput lies against the sacrum and the forces of labor are directed against the fetal mentum, the neck may extend further, leading to a face presentation.

The persistent brow presentation with subsequent delivery only occurs in cases of a large pelvis and/or a small infant. Women with gynecoid pelvis or multiparity may be given the option to labor; however, dysfunctional labor and cephalopelvic disproportion are more likely if this presentation persists.

Labor management of face and brow presentation requires close observation of labor progression because cephalopelvic disproportion, dysfunctional labor, and prolonged labor are much more common. As mentioned above, the trachelobregmatic or submentobregmatic diameters are larger than the suboccipitobregmatic diameter. Duration of labor with a face presentation is generally the same as duration of labor with a vertex presentation, although a prolonged labor may occur. As long as maternal or fetal compromise is not evident, labor with a face presentation may continue. [ 6 ] A persistent mentum posterior presentation is an indication for delivery by cesarean section.

Continuous electronic fetal heart rate monitoring is considered mandatory by many authors because of the increased incidence of abnormal fetal heart rate patterns and/or nonreassuring fetal heart rate patterns. [ 7 ] An internal fetal scalp electrode may be used, but very careful application of the electrode must be ensured. The mentum is the recommended site of application. Facial edema is common and can obscure the fetal facial anatomy and improper placement can lead to facial and ophthalmic injuries. Oxytocin can be used to augment labor using the same precautions as in a vertex presentation and the same criteria of assessment of uterine activity, adequacy of the pelvis, and reassuring fetal heart tracing.

Fetuses with face presentation can be delivered vaginally with overall success rates of 60-70%, while more than 20% of fetuses with face presentation require cesarean delivery. Cesarean delivery is performed for the usual obstetrical indications, including arrest of labor and nonreassuring fetal heart rate pattern.

Attempts to manually convert the face to vertex (Thom maneuver) or to rotate a posterior position to a more favorable anterior mentum position are rarely successful and are associated with high fetal morbidity and mortality and maternal morbidity, including cord prolapse, uterine rupture, and fetal cervical spine injury with neurological impairment. Given the availability and safety of cesarean delivery, internal rotation maneuvers are no longer justified unless cesarean section cannot be readily performed.

Internal podalic version and breech extraction are also no longer recommended in the modern management of the face presentation. [ 8 ]

Operative delivery with forceps must be approached with caution. Since engagement occurs when the face is at +2 position, forceps should only be applied to the face that has caused the perineum to bulge. Increased complications to both mother and fetus can occur [ 9 ] and operative delivery must be approached with caution or reserved when cesarean section is not readily available. Forceps may be used if the mentum is anterior. Although the landmarks are different, the application of any forceps is made as if the fetus were presenting directly in the occiput anterior position. The mouth substitutes for the posterior fontanelle, and the mentum substitutes for the occiput. Traction should be downward to maintain extension until the mentum passes under the symphysis, and then gradually elevated to allow the head to deliver by flexion. During delivery, hyperextension of the fetal head should be avoided.

As previously mentioned, the persistent brow presentation has a poor prognosis for vaginal delivery unless the fetus is small, premature, or the maternal pelvis is large. Expectant management is reasonable if labor is progressing well and the fetal well-being is assessed, as there can be spontaneous conversion to face or vertex presentation. The earlier in labor that brow presentation is diagnosed, the higher the likelihood of conversion. Minimal intervention during labor is recommended and some feel the use of oxytocin in the brow presentation is contraindicated.

The use of operative vaginal delivery or manual conversion of a brow to a more favorable presentation is contraindicated as the risks of perinatal morbidity and mortality are unacceptably high. Prolonged, dysfunctional, and arrest of labor are common, necessitating cesarean section delivery.

The incidence of perinatal morbidity and mortality and maternal morbidity has decreased due to the increased incidence of cesarean section delivery for malpresentation, including face and brow presentation.

Neonates delivered in the face presentation exhibit significant facial and skull edema, which usually resolves within 24-48 hours. Trauma during labor may cause tracheal and laryngeal edema immediately after delivery, which can result in neonatal respiratory distress. In addition, fetal anomalies or tumors, such as fetal goiters that may have contributed to fetal malpresentation, may make intubation difficult. Physicians with expertise in neonatal resuscitation should be present at delivery in the event that intubation is required. When a fetal anomaly has been previously diagnosed by ultrasonographic evaluation, the appropriate pediatric specialists should be consulted and informed at time of labor.

Bellussi F, Ghi T, Youssef A, et al. The use of intrapartum ultrasound to diagnose malpositions and cephalic malpresentations. Am J Obstet Gynecol . 2017 Dec. 217 (6):633-41. [QxMD MEDLINE Link] .

[Guideline] Ghi T, Eggebø T, Lees C, et al. ISUOG Practice Guidelines: intrapartum ultrasound. Ultrasound Obstet Gynecol . 2018 Jul. 52 (1):128-39. [QxMD MEDLINE Link] . [Full Text] .

Shaffer BL, Cheng YW, Vargas JE, Laros RK Jr, Caughey AB. Face presentation: predictors and delivery route. Am J Obstet Gynecol . 2006 May. 194(5):e10-2. [QxMD MEDLINE Link] .

Borell U, Fernstrom I. The mechanism of labour. Radiol Clin North Am . 1967 Apr. 5(1):73-85. [QxMD MEDLINE Link] .

Borell U, Fernstrom I. The mechanism of labour in face and brow presentation: a radiographic study. Acta Obstet Gynecol Scand . 1960. 39:626-44.

Gardberg M, Leonova Y, Laakkonen E. Malpresentations--impact on mode of delivery. Acta Obstet Gynecol Scand . 2011 May. 90(5):540-2. [QxMD MEDLINE Link] .

Collaris RJ, Oei SG. External cephalic version: a safe procedure? A systematic review of version-related risks. Acta Obstet Gynecol Scand . 2004 Jun. 83(6):511-8. [QxMD MEDLINE Link] .

Verspyck E, Bisson V, Gromez A, Resch B, Diguet A, Marpeau L. Prophylactic attempt at manual rotation in brow presentation at full dilatation. Acta Obstet Gynecol Scand . 2012 Nov. 91(11):1342-5. [QxMD MEDLINE Link] .

Johnson JH, Figueroa R, Garry D. Immediate maternal and neonatal effects of forceps and vacuum-assisted deliveries. Obstet Gynecol . 2004 Mar. 103(3):513-8. [QxMD MEDLINE Link] .

Benedetti TJ, Lowensohn RI, Truscott AM. Face presentation at term. Obstet Gynecol . 1980 Feb. 55(2):199-202. [QxMD MEDLINE Link] .

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Contributor Information and Disclosures

Teresa Marino, MD Assistant Professor, Attending Physician, Division of Maternal-Fetal Medicine, Tufts Medical Center Disclosure: Nothing to disclose.

Francisco Talavera, PharmD, PhD Adjunct Assistant Professor, University of Nebraska Medical Center College of Pharmacy; Editor-in-Chief, Medscape Drug Reference Disclosure: Received salary from Medscape for employment. for: Medscape.

Carl V Smith, MD The Distinguished Chris J and Marie A Olson Chair of Obstetrics and Gynecology, Professor, Department of Obstetrics and Gynecology, Senior Associate Dean for Clinical Affairs, University of Nebraska Medical Center Carl V Smith, MD is a member of the following medical societies: American College of Obstetricians and Gynecologists , American Institute of Ultrasound in Medicine , Association of Professors of Gynecology and Obstetrics , Central Association of Obstetricians and Gynecologists , Society for Maternal-Fetal Medicine , Council of University Chairs of Obstetrics and Gynecology , Nebraska Medical Association Disclosure: Nothing to disclose.

Chitra M Iyer, MD, Perinatologist, Obstetrix Medical Group, Fort Worth, Texas.

Chitra M Iyer, MD is a member of the following medical societies: American College of Obstetricians and Gynecologists , Society of Maternal-Fetal Medicine .

Disclosure: Nothing to disclose.

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Management of face presentation, face and lip edema in a primary healthcare facility case report, Mbengwi, Cameroon

Nzozone henry fomukong.

1 Microhealth Global Medical Centre, Mbengwi, Cameroon

2 Department of Medicine and Surgery, Faculty of Health Sciences University of Buea, Buea, Cameroon

Ngouagna Edwin

Mandeng ma linwa edgar, ngwayu claude nkfusai.

3 Department of Microbiology and Parasitology, Faculty of Science, University of Buea, Buea, Cameroon

4 Cameroon Baptist Convention Health Services (CBCHS), Yaoundé, Cameroon

Yunga Patience Ijang

5 Department of Public Health, School of Health Sciences, Catholic University of Central Africa, Box 1110, Yaoundé, Cameroon

Joyce Shirinde

6 School of Health Systems and Public Health, Faculty of Health Sciences, University of Pretoria Private Bag X323, Gezina, Pretoria, 0001, Pretoria, South Africa

Samuel Nambile Cumber

7 Institute of Medicine, Department of Public Health and Community Medicine (EPSO), University of Gothenburg, Box 414, SE - 405 30 Gothenburg, Sweden

8 Faculty of Health Sciences, University of the Free State, Bloemfontein, South Africa

Face presentation is a rare obstetric event and most practitioners will go through their carriers without ever meeting one. Face presentation can be delivered vaginally only if the foetus is in the mentum anterior position. More than half of the cases of face presentation are delivered by caesarean section. Newborn infants with face presentation usually have severe facial oedema, facial bruising or ecchymosis. These syndromic facial features usually resolved within 24-48 hours.

Introduction

Face presentation is a rare unanticipated obstetric event characterized by a longitudinal lie and full extension of the foetal head on the neck with the occiput against the upper back [ 1 - 3 ]. Face presentation occurs in 0.1-0.2% of deliveries [ 3 - 5 ] but is more common in black women and in multiparous women [ 5 ]. Studies have shown that 60 per cent of face presentations have one or more of the following risk factors: small fetus, large fetus, high parity, previous caesarean section (CS), contracted pelvis, fetopelvic disproportion, cord around the neck multiple pregnancy, hypertensive disorders of pregnancy, polyhydramnios, uterine or nuchal cord anomaly. But 40 per cent of face presentations occur with none of these factors [ 6 , 7 ]. A vaginal birth at term is possible only if the fetus is in the mentum anterior position. More than half of cases of face presentation are delivered by caesarean section [ 4 ]. Newborn infants with face presentation usually have severe facial edema, facial bruising or ecchymosis [ 8 ]. Repeated vaginal examination to assess the presenting part and the progress of labor may lead to bruises in the face as well as damage to the eyes.

Patient and observation

Case presentation: a 21 year old primigravida at 40 weeks gestation from the last normal menstrual period referred to our facility for prolonged second stage of labor after visiting two health centres. She labored for a total of 14hrs, membrane ruptured spontaneously 12hrs before referral. Amniotic fluid was documented by midwife to be clear. She attended antenatal clinics in Mbengwi health centre 5 times, was diagnosed of hepatitis B during antenatal consultations, received no treatment. She did not do any ultrasound due to financial constraints. On examination, she was healthy, in painful distress, blood pressure 131/76mmhg, pulse 85 beats/min, temperature 37.2 o C SPO2 98%. On abdominal exams, uterus was gravid, fundal height 35cm, lie longitudinal, fetal heart rate 137bpm, cephalic presentation, engaged 2/5, with moderate contractions of 2 in 10 minutes. On vaginal examination, cervix was fully dilated, membranes ruptured, presenting part was face, mentum anterior. The conclusion made was mento-anterior face presentation ( Figure 1 ). Paturient was counseled, labor was augmented with 1 amp of oxytocin in 500ml of glucose 5% and started at 10drops/mins. Ten minutes later she delivered a male baby with Apgar score 6/10, 8/10 on the first and fifth minute. The baby weighed 3.2kg, length was 50cm, and head circumference was 41cm. Syndromic facial appearance with marked edema at the baby's lips, face and scalp was evident and he had bruising on the right nasolabial groove and right cheeks ( Figure 2 ). Physical examination of the infant's respiratory system, cardiovascular system, and his abdominal examination were normal, as was his neurological examination. Placenta was delivered by controlled cord traction 5mins later with all cotyledons. Delivery was complicated by a second degree perineal tear. Perineal tear was repaired with absorbable suture under local anaesthesia. Estimated blood lost was 350ml. baby received Hepatitis B immunoglobulins, hepatitis B vaccine and vitamin K were administered to the baby. 24 hours later, facial swellings resolved ( Figure 3 ), baby breast feeds well. Baby and mother were discharged on day 3 postpartum all fine.

Men-tum anterior face presentation

Bruising, marked lip and facial edema

Baby 24 hours later with all syndromic facial features resolved

Ethics : informed consent: written informed consent was obtained from the patient's parents for the publication of this case report.

Face presentation is a rare obstetric event and most practitioner will go through their carriers without ever meeting one [ 3 ]. We presented a case of face presentation noticed in the delivery room on digital examination in a patient with no risk factors. In a poor resource setting as ours where ultrasound is not readily available, this event is often scary and confusing to most midwives and nurses. This may prompt repeated vaginal exams for confirmation of presentation. This intend will lead to bruising of the baby's face and delay effective management [ 8 ]. Exact knowledge about the fetal position and level is important for providing the correct management of this malpresentation. When face presentation is diagnosed, around 60% of cases are in the mentum anterior position, 25% are mentum posterior and 15% are mentum transverse [ 5 ]. The patient presented the most common form of face presentation (mentum anterior). Labor was augmented, vaginal delivery was attempted and successfully conducted. Facial bruising, lip and face edema are very common complication of face presentation. These complications usually resolve within 24-48 hours [ 9 , 10 ] in this case facial edema completely resolved within 24hours ( Figure 3 ) and baby breastfeed well.

Repeated vaginal exams should be avoided when presenting part is unsure. Vaginal delivery should be attemped only on mentum anterior face presentation, in other cases, emergency ceserian section should be performed. Syndromic facial features in babies born from face presentation resolve completely within 24-48 hours.

Competing interests

The authors declare no competing interests.

Acknowledgements

We thank the participant of this study.

Authors’ contributions

NHF, NE, MMLE, NCN, YPI, FB, JS and SNC conceived the case series, assisted with the study design and participant enrollment, designed the study protocol and collected the data. NE, MMLE, NCN and SNC assisted in interpretation of results and wrote the manuscript. All authors read and approved the final manuscript.

7.9 Face presentation

7.9.1 diagnosis.

• Palpation of the mother's abdomen at the start of labour: palpate the occipital region; a cleft between the head and the back will be palpable, due to hyperextension of the head.
• On vaginal examination: no suture or fontanelle can be felt; orbits, nose, mouth, ears and chin palpable. Palpation of the chin is essential to confirm the diagnosis.

7.9.2 Management

Determine the orientation of the chin—anterior (at the mother's pubis) or posterior.

The chin is anterior

Vaginal delivery is possible. Labour may be slow, patience is required. If uterine contractions are inadequate, oxytocin may be used. Episiotomy is usually needed during delivery (Figures 7.4), given the maximum amount the perineum can stretch. If instrumental delivery is necessary, use forceps. Vacuum extraction is contra-indicated for a live fœtus.

Figures 7.4 - Chin anterior: delivery possible

The chin is posterior

Vaginal delivery is not possible (Figure 7.5). A caesarean section must be arranged. Refer if necessary.

Figure 7.5 - Chin posterior: impaction

If caesarean section is not feasible and referral is not possible, attempt the following manoeuvres:

• Flex the head to obtain a vertex presentation: with one hand in the vagina, grasp the top of the skull and flex the neck, using the other hand, on the abdomen, to apply pressure to the foetal chest and buttocks. Obviously, the presenting part must not be engaged, and it is often hard—or impossible—to keep the head flexed (Figures 7.6).

• Rotate the head to bring the chin anteriorly: push the face and chin back to free the shoulders from the pelvic inlet then, turn the head within the pelvic cavity, using a hand on the abdomen to help the rotation by applying pressure to the shoulders. In this way, the chin is brought to the front (Figures 7.7).

• Version: internal podalic version, then total breech extraction (Figure 7.8).

All these manoeuvres are difficult and pose a significant risk of uterine rupture. They must be done when the uterus is not contracting. Whenever possible, caesarean section should be performed instead.

Fetal Presentation, Position, and Lie (Including Breech Presentation)

• Variations in Fetal Position and Presentation |

During pregnancy, the fetus can be positioned in many different ways inside the mother's uterus. The fetus may be head up or down or facing the mother's back or front. At first, the fetus can move around easily or shift position as the mother moves. Toward the end of the pregnancy the fetus is larger, has less room to move, and stays in one position. How the fetus is positioned has an important effect on delivery and, for certain positions, a cesarean delivery is necessary. There are medical terms that describe precisely how the fetus is positioned, and identifying the fetal position helps doctors to anticipate potential difficulties during labor and delivery.

Presentation refers to the part of the fetus’s body that leads the way out through the birth canal (called the presenting part). Usually, the head leads the way, but sometimes the buttocks (breech presentation), shoulder, or face leads the way.

Position refers to whether the fetus is facing backward (occiput anterior) or forward (occiput posterior). The occiput is a bone at the back of the baby's head. Therefore, facing backward is called occiput anterior (facing the mother’s back and facing down when the mother lies on her back). Facing forward is called occiput posterior (facing toward the mother's pubic bone and facing up when the mother lies on her back).

Lie refers to the angle of the fetus in relation to the mother and the uterus. Up-and-down (with the baby's spine parallel to mother's spine, called longitudinal) is normal, but sometimes the lie is sideways (transverse) or at an angle (oblique).

For these aspects of fetal positioning, the combination that is the most common, safest, and easiest for the mother to deliver is the following:

Head first (called vertex or cephalic presentation)

Facing backward (occiput anterior position)

Spine parallel to mother's spine (longitudinal lie)

Neck bent forward with chin tucked

Arms folded across the chest

If the fetus is in a different position, lie, or presentation, labor may be more difficult, and a normal vaginal delivery may not be possible.

Variations in fetal presentation, position, or lie may occur when

The fetus is too large for the mother's pelvis (fetopelvic disproportion).

The uterus is abnormally shaped or contains growths such as fibroids .

The fetus has a birth defect .

There is more than one fetus (multiple gestation).

Position and Presentation of the Fetus

Variations in Fetal Position and Presentation

Some variations in position and presentation that make delivery difficult occur frequently.

Occiput posterior position

In occiput posterior position (sometimes called sunny-side up), the fetus is head first (vertex presentation) but is facing forward (toward the mother's pubic bone—that is, facing up when the mother lies on her back). This is a very common position that is not abnormal, but it makes delivery more difficult than when the fetus is in the occiput anterior position (facing toward the mother's spine—that is facing down when the mother lies on her back).

When a fetus faces up, the neck is often straightened rather than bent,which requires more room for the head to pass through the birth canal. Delivery assisted by a vacuum device or forceps or cesarean delivery may be necessary.

Breech presentation

In breech presentation, the baby's buttocks or sometimes the feet are positioned to deliver first (before the head).

When delivered vaginally, babies that present buttocks first are more at risk of injury or even death than those that present head first.

The reason for the risks to babies in breech presentation is that the baby's hips and buttocks are not as wide as the head. Therefore, when the hips and buttocks pass through the cervix first, the passageway may not be wide enough for the head to pass through. In addition, when the head follows the buttocks, the neck may be bent slightly backwards. The neck being bent backward increases the width required for delivery as compared to when the head is angled forward with the chin tucked, which is the position that is easiest for delivery. Thus, the baby’s body may be delivered and then the head may get caught and not be able to pass through the birth canal. When the baby’s head is caught, this puts pressure on the umbilical cord in the birth canal, so that very little oxygen can reach the baby. Brain damage due to lack of oxygen is more common among breech babies than among those presenting head first.

In a first delivery, these problems may occur more frequently because a woman’s tissues have not been stretched by previous deliveries. Because of risk of injury or even death to the baby, cesarean delivery is preferred when the fetus is in breech presentation, unless the doctor is very experienced with and skilled at delivering breech babies or there is not an adequate facility or equipment to safely perform a cesarean delivery.

Breech presentation is more likely to occur in the following circumstances:

Labor starts too soon (preterm labor).

The uterus is abnormally shaped or contains abnormal growths such as fibroids .

Other presentations

In face presentation, the baby's neck arches back so that the face presents first rather than the top of the head.

In brow presentation, the neck is moderately arched so that the brow presents first.

Usually, fetuses do not stay in a face or brow presentation. These presentations often change to a vertex (top of the head) presentation before or during labor. If they do not, a cesarean delivery is usually recommended.

In transverse lie, the fetus lies horizontally across the birth canal and presents shoulder first. A cesarean delivery is done, unless the fetus is the second in a set of twins. In such a case, the fetus may be turned to be delivered through the vagina.

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Delivery, Face and Brow Presentation

Introduction.

The term presentation describes the leading part of the fetus or the anatomical structure closest to the maternal pelvic inlet during labor. The presentation can roughly be divided into the following classifications: cephalic, breech, shoulder, and compound. Cephalic presentation is the most common and can be further subclassified as vertex, sinciput, brow, face, and chin. The most common presentation in term labor is the vertex, where the fetal neck is flexed to the chin, minimizing the head circumference. Face presentation is an abnormal form of cephalic presentation where the presenting part is the mentum. This typically occurs because of hyperextension of the neck and the occiput touching the fetal back. Incidence of face presentation is rare, accounting for approximately 1 in 600 of all presentations. [1] [2] [3]  In brow presentation, the neck is not extended as much as in face presentation, and the leading part is the area between the anterior fontanelle and the orbital ridges. Brow presentation is considered the rarest of all malpresentation, with a prevalence of 1 in 500 to 1 in 4000 deliveries. [3]

Both face and brow presentations occur due to extension of the fetal neck instead of flexion; therefore, conditions that would lead to hyperextension or prevent flexion of the fetal neck can all contribute to face or brow presentation. These risk factors may be related to either the mother or the fetus. Maternal risk factors are preterm delivery, contracted maternal pelvis, platypelloid pelvis, multiparity, previous cesarean section, and black race. Fetal risk factors include anencephaly, multiple loops of cord around the neck, masses of the neck, macrosomia, and polyhydramnios. [2] [4] [5]  These malpresentations are usually diagnosed during the second stage of labor when performing a digital examination. Palpating orbital ridges, nose, malar eminences, mentum, mouth, gums, and chin in face presentation is possible. Based on the position of the chin, face presentation can be further divided into mentum anterior, posterior, or transverse. In brow presentation, the anterior fontanelle and face can be palpated except for the mouth and the chin. Brow presentation can then be further described based on the position of the anterior fontanelle as frontal anterior, posterior, or transverse. Diagnosing the exact presentation can be challenging, and face presentation may be misdiagnosed as frank breech. To avoid any confusion, a bedside ultrasound scan can be performed. [6]  Ultrasound imaging can show a reduced angle between the occiput and the spine or the chin is separated from the chest. However, ultrasound does not provide much predictive value for the outcome of labor. [7]

Anatomy and Physiology

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Before discussing the mechanism of labor in the face or brow presentation, it is crucial to highlight some anatomical landmarks and their measurements. 

Planes and Diameters of the Pelvis

The 3 most important planes in the female pelvis are the pelvic inlet, mid-pelvis, and pelvic outlet. Four diameters can describe the pelvic inlet: anteroposterior, transverse, and 2 obliques. Furthermore, based on the landmarks on the pelvic inlet, there are 3 different anteroposterior diameters named conjugates: true conjugate, obstetrical conjugate, and diagonal conjugate. Only the latter can be measured directly during the obstetric examination. The shortest of these 3 diameters is obstetrical conjugate, which measures approximately 10.5 cm and is the distance between the sacral promontory and 1 cm below the upper border of the symphysis pubis. This measurement is clinically significant as the fetal head must pass through this diameter during the engagement phase. The transverse diameter measures about 13.5 cm and is the widest distance between the innominate line on both sides. The shortest distance in the mid pelvis is the interspinous diameter and usually is only about 10 cm. 

Fetal Skull Diameters

There are 6 distinguished longitudinal fetal skull diameters:

• Suboccipito-bregmatic: from the center of anterior fontanelle (bregma) to the occipital protuberance, measuring 9.5 cm. This is the diameter presented in the vertex presentation. 
• Suboccipito-frontal: from the anterior part of bregma to the occipital protuberance, measuring 10 cm 
• Occipito-frontal: from the root of the nose to the most prominent part of the occiput, measuring 11.5 cm
• Submento-bregmatic: from the center of the bregma to the angle of the mandible, measuring 9.5 cm. This is the diameter in the face presentation where the neck is hyperextended. 
• Submento-vertical: from the midpoint between fontanelles and the angle of the mandible, measuring 11.5 cm 
• Occipito-mental: from the midpoint between fontanelles and the tip of the chin, measuring 13.5 cm. It is the presenting diameter in brow presentation. 

Cardinal Movements of Normal Labor

• Neck flexion
• Internal rotation
• Extension (delivers head)
• External rotation (restitution)
• Expulsion (delivery of anterior and posterior shoulders)

Some key movements are impossible in the face or brow presentations. Based on the information provided above, it is obvious that labor be arrested in brow presentation unless it spontaneously changes to the face or vertex, as the occipito-mental diameter of the fetal head is significantly wider than the smallest diameter of the female pelvis. Face presentation can, however, be delivered vaginally, and further mechanisms of face delivery are explained in later sections.

Indications

As mentioned previously, spontaneous vaginal delivery can be successful in face presentation. However, the main indication for vaginal delivery in such circumstances would be a maternal choice. It is crucial to have a thorough conversation with a mother, explaining the risks and benefits of vaginal delivery with face presentation and a cesarean section. Informed consent and creating a rapport with the mother is an essential aspect of safe and successful labor.

Contraindications

Vaginal delivery of face presentation is contraindicated if the mentum is lying posteriorly or is in a transverse position. In such a scenario, the fetal brow is pressing against the maternal symphysis pubis, and the short fetal neck, which is already maximally extended, cannot span the surface of the maternal sacrum. In this position, the diameter of the head is larger than the maternal pelvis, and it cannot descend through the birth canal. Therefore, the cesarean section is recommended as the safest mode of delivery for mentum posterior face presentations. Attempts to manually convert face presentation to vertex, manual or forceps rotation of the persistent posterior chin to anterior are contraindicated as they can be dangerous. Persistent brow presentation itself is a contraindication for vaginal delivery unless the fetus is significantly small or the maternal pelvis is large.

Continuous electronic fetal heart rate monitoring is recommended for face and brow presentations, as heart rate abnormalities are common in these scenarios. One study found that only 14% of the cases with face presentation had no abnormal traces on the cardiotocograph. [8]  External transducer devices are advised to prevent damage to the eyes. When internal monitoring is inevitable, monitoring devices on bony parts should be placed carefully. 

Consultations that are typically requested for patients with delivery of face/brow presentation include the following:

• Experienced midwife, preferably looking after laboring women 1:1
• Senior obstetrician 
• Neonatal team - in case of need for resuscitation 
• Anesthetic team - to provide necessary pain control (eg, epidural)
• Theatre team  - in case of failure to progress, an emergency cesarean section is required.

Preparation

No specific preparation is required for face or brow presentation. However, discussing the labor options with the mother and birthing partner and informing members of the neonatal, anesthetic, and theatre co-ordinating teams is essential.

Technique or Treatment

Mechanism of Labor in Face Presentation

During contractions, the pressure exerted by the fundus of the uterus on the fetus and the pressure of the amniotic fluid initiate descent. During this descent, the fetal neck extends instead of flexing. The internal rotation determines the outcome of delivery. If the fetal chin rotates posteriorly, vaginal delivery would not be possible, and cesarean section is permitted. The approach towards mentum-posterior delivery should be individualized, as the cases are rare. Expectant management is acceptable in multiparous women with small fetuses, as a spontaneous mentum-anterior rotation can occur. However, there should be a low threshold for cesarean section in primigravida women or women with large fetuses.

The pubis is described as mentum-anterior when the fetal chin is rotated towards the maternal symphysis. In these cases, further descent through the vaginal canal continues, with approximately 73% of cases delivering spontaneously. [9]  The fetal mentum presses on the maternal symphysis pubis, and the head is delivered by flexion. The occiput is pointing towards the maternal back, and external rotation happens. Shoulders are delivered in the same manner as in vertex delivery.

Mechanism of Labor in Brow Presentation

As this presentation is considered unstable, it is usually converted into a face or an occiput presentation. Due to the cephalic diameter being wider than the maternal pelvis, the fetal head cannot engage; thus, brow delivery cannot occur. Unless the fetus is small or the pelvis is very wide, the prognosis for vaginal delivery is poor. With persistent brow presentation, a cesarean section is required for safe delivery.

Complications

As the cesarean section is becoming a more accessible mode of delivery in malpresentations, the incidence of maternal and fetal morbidity and mortality during face presentation has dropped significantly. [10]  However, some complications are still associated with the nature of labor in face presentation. Due to the fetal head position, it is more challenging for the head to engage in the birth canal and descend, resulting in prolonged labor. Prolonged labor itself can provoke fetal distress and arrhythmias. If the labor arrests or signs of fetal distress appear on CTG, the recommended next step in management is an emergency cesarean section, which in itself carries a myriad of operative and post-operative complications. Finally, due to the nature of the fetal position and prolonged duration of labor in face presentation, neonates develop significant edema of the skull and face. Swelling of the fetal airway may also be present, resulting in respiratory distress after birth and possible intubation.

Clinical Significance

During vertex presentation, the fetal head flexes, bringing the chin to the chest, forming the smallest possible fetal head diameter, measuring approximately 9.5 cm. With face and brow presentation, the neck hyperextends, resulting in greater cephalic diameters. As a result, the fetal head engages later, and labor progresses more slowly. Failure to progress in labor is also more common in both presentations compared to the vertex presentation. Furthermore, when the fetal chin is in a posterior position, this prevents further flexion of the fetal neck, as browns are pressing on the symphysis pubis. As a result, descending through the birth canal is impossible. Such presentation is considered undeliverable vaginally and requires an emergency cesarean section. Manual attempts to change face presentation to vertex or manual or forceps rotation to mentum anterior are considered dangerous and discouraged.

Enhancing Healthcare Team Outcomes

A multidisciplinary team of healthcare experts supports the woman and her child during labor and the perinatal period. For a face or brow presentation to be appropriately diagnosed, an experienced midwife and obstetrician must be involved in the vaginal examination and labor monitoring. As fetal anomalies, such as anencephaly or goiter, can contribute to face presentation, sonographers experienced in antenatal scanning should also be involved in the care. It is advised to inform the anesthetic and neonatal teams in advance of the possible need for emergency cesarean section and resuscitation of the neonate. [11] [12]

Gardberg M, Leonova Y, Laakkonen E. Malpresentations--impact on mode of delivery. Acta obstetricia et gynecologica Scandinavica. 2011 May:90(5):540-2. doi: 10.1111/j.1600-0412.2011.01105.x. Epub     [PubMed PMID: 21501123]

Tapisiz OL, Aytan H, Altinbas SK, Arman F, Tuncay G, Besli M, Mollamahmutoglu L, Danışman N. Face presentation at term: a forgotten issue. The journal of obstetrics and gynaecology research. 2014 Jun:40(6):1573-7. doi: 10.1111/jog.12369. Epub     [PubMed PMID: 24888918]

Zayed F, Amarin Z, Obeidat B, Obeidat N, Alchalabi H, Lataifeh I. Face and brow presentation in northern Jordan, over a decade of experience. Archives of gynecology and obstetrics. 2008 Nov:278(5):427-30. doi: 10.1007/s00404-008-0600-0. Epub 2008 Feb 19     [PubMed PMID: 18283473]

Bashiri A,Burstein E,Bar-David J,Levy A,Mazor M, Face and brow presentation: independent risk factors. The journal of maternal-fetal     [PubMed PMID: 18570114]

Shaffer BL, Cheng YW, Vargas JE, Laros RK Jr, Caughey AB. Face presentation: predictors and delivery route. American journal of obstetrics and gynecology. 2006 May:194(5):e10-2     [PubMed PMID: 16647888]

Bellussi F, Ghi T, Youssef A, Salsi G, Giorgetta F, Parma D, Simonazzi G, Pilu G. The use of intrapartum ultrasound to diagnose malpositions and cephalic malpresentations. American journal of obstetrics and gynecology. 2017 Dec:217(6):633-641. doi: 10.1016/j.ajog.2017.07.025. Epub 2017 Jul 22     [PubMed PMID: 28743440]

Ghi T, Eggebø T, Lees C, Kalache K, Rozenberg P, Youssef A, Salomon LJ, Tutschek B. ISUOG Practice Guidelines: intrapartum ultrasound. Ultrasound in obstetrics & gynecology : the official journal of the International Society of Ultrasound in Obstetrics and Gynecology. 2018 Jul:52(1):128-139. doi: 10.1002/uog.19072. Epub     [PubMed PMID: 29974596]

Benedetti TJ, Lowensohn RI, Truscott AM. Face presentation at term. Obstetrics and gynecology. 1980 Feb:55(2):199-202     [PubMed PMID: 7352081]

Ducarme G, Ceccaldi PF, Chesnoy V, Robinet G, Gabriel R. [Face presentation: retrospective study of 32 cases at term]. Gynecologie, obstetrique & fertilite. 2006 May:34(5):393-6     [PubMed PMID: 16630740]

Cruikshank DP, Cruikshank JE. Face and brow presentation: a review. Clinical obstetrics and gynecology. 1981 Jun:24(2):333-51     [PubMed PMID: 7307363]

Domingues AP, Belo A, Moura P, Vieira DN. Medico-legal litigation in Obstetrics: a characterization analysis of a decade in Portugal. Revista brasileira de ginecologia e obstetricia : revista da Federacao Brasileira das Sociedades de Ginecologia e Obstetricia. 2015 May:37(5):241-6. doi: 10.1590/SO100-720320150005304. Epub     [PubMed PMID: 26107576]

. Intrapartum care for healthy women and babies. 2022 Dec 14:():     [PubMed PMID: 32212591]

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Face presentation

Latest Posts , Labour & Delivery

She still had intact membranes. The midwife asked me to come as she was starting to get pressure. She concluded the conversation by saying: “I think it is a face presentation”.

I attended at once. She had ruptured her membranes just prior to my arrival. I did an internal examination and sure enough, it was a face presentation with chin being anterior. Her cervix was now fully dilated.

She could feel pressure with contractions so I encouraged them to push. With pushing over two contractions she delivered her baby face first and chin up. With the next contraction, she delivered the rest of the baby. She had a boy weighing 3.8Kg and born in good condition. She had an intact perineum. No stitches were needed.

The incidence of face presentation is reported to be between 1 in 500 deliveries to 1 in 1400 deliveries. It happens when the baby’s head is very extended backwards. Fortunately, it was a mento-anterior face presentation as a mento-posterior face presentation usually needs a Caesarean section. Also, that it was her third vaginal delivery and that the patient could push so well meant it was a very straightforward but different delivery.

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