Otocephaly:Agnathia Microstomia Synotia Syndrome-A Case Report

Eastern University Sri Lanka, Sri Lanka

*Corresponding Author:

Vishnu Sivapatham
Eastern University Sri Lanka
Sri Lanka
Tel: 94714434996
E-mail: vishnukumars@esn.ac.lk

Received date: December 19, 2016; Accepted date: December 28, 2016; Published date: December 31, 2016

Citation: Sivapatham V, Jayamanne CJP, Kumara S, Jayasinghe B, Fonseka R (2016) Otocephaly:Agnathia Microstomia Synotia Syndrome-A Case Report. J Preg Child Health 3:295. doi:10.4172/2376-127X.1000295

Copyright: © 2016 Sivapatham V, et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution and reproduction in any medium, provided the original author and source are credited.

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Abstract

Otocephaly is characterized by aplasia or hypoplasia of mandible, a small oral fissure and low lying ears at the level of neck usually meeting in the midline. This is due to the failure of migration of the ventral part of the first brachial arch. This rare lethal non familial condition occurs in 1 in 70,000 births. This is the first reported case of otocephaly in Sri Lanka as per our best knowledge, a baby girl born to non-consanguineous parents, who was unable to survive a long time after birth. This case is being reported because of its rarity.

Keywords

Agnathia; Antenatal diagnosis; Otocephaly.

Case Report

A 38 year old mother of two admitted on her 5th pregnancy to Castle Street Hospital for Women, Colombo, Sri Lanka for the assessment of blood sugar series at gestational age of 29+2 weeks. Father is 40 year old and there is no consanguinity. The outcome of her first pregnancy was 2nd trimester miscarriage and other three pregnancies were ended up in spontaneous premature birth at 26th, 30th and 33th week of gestation respectively. Her second baby died on 2nd day of life due to sepsis and there were no gross abnormalities detected. Other two children are healthy at their age of 9 and 4, respectively. This is a spontaneous conception, there is no exposure to teratogens or infection during the pregnancy and she didn’t use any hormonal contraception. Dating scan was done and cervical cerclage was put at 14th week of gestation. She developed gestational diabetes mellitus at 21st week of gestation and since then on diabetic diet with good control of blood sugar. Polyhydramnios was noted on ultrasound scan at 24th week of gestation.

Detail ultrasound scan on this admission revealed a single live fetus with an amniotic fluid index of 43 cm and an estimated fetal weight of 1250 g. There was no definite fetal stomach noted which led to a suspicion of a possibility of esophageal atresia. During the hospital stay she went in to spontaneous labor. Baby girl was born normal vaginally with birth weight of 1350 g. Examination of the baby revealed downwards slanted eyes, hypertelorism, very small oral aperture (Microstomia) with blind ended pouch confirmed by inability to pass the orogastric tube, absence of mandible (Agnathia) and external ears displaced ventromedially in the neck close to the mid line (Synotia) (Figure 1). Rest of the clinical examination was normal. Baby died soon after the birth without any active resuscitation, considering the gross abnormalities. Autopsy was advised but refused by the parents. Mother was discharged on following day after counselling with family planning advices.

Figure 1: Shows microstomia, absence of mandible (agnathia) and low-set ventromedial.

Discussion

Otocephaly is a rare lethal syndrome of microstomia, agnatia and ear anomalies. Other anomalies associated are holoprosenxcephaly, cephalocele, dysgenesis of corpus colossus, atresis of third ventricle, skeletal, genitourinary, cardiovascular system, endocrine gland hypoplasia [1,2]. The incidence of otocephaly which is a rare idiopathic malformation in humans is 1 per 70,000 new-borns [3]. Every pharyngeal arch has a core of cartilage, unsegmented mesoderm, an artery from aortic arch and a nerve that enters it from the brain stem carrying motor fibers to supply the skeletal muscle derived from the mesoderm [1].

Arrest in the development of the first branchial arch due to an insult to the neural crest cells has been proposed to be the cause of this condition, which may be induced by chromosomal mutation or teratogens. Otocephaly, with associated anomalies are considered lethal due to severe respiratory dysfunction. Otocephaly is usually suspected on radiological antenatal checkup specially during the third trimester when it is impossible to visualize the mandible and ears are in a very low and medial position [2,4]. Polyhydramnios may be the presenting feature during pregnancy [3]. In Sri Lanka the termination of the pregnancy is only considered if the life of the mother is in danger due to the pregnancy, so the antenatal identification of such cases over helps the parents to prepare for the delivery.

The syndrome complex of otocephaly is divided into four types: 1. Isolated agnathia; 2. Agnathia with holoprosencephaly; 3. Agnathia with situsinversus and visceral anomalies; 4. Agnathia, holoprosencephaly, situsinversus and other visceral anomalies [5]. The case we describe belongs to type 2. Otocephaly anomaly shows spectrum of various manifestations ranges in severity from severe micrognathia as a part of the robin sequence to cyclopiaholoprosencephaly [6].

Conclusion

Prenatal diagnosis of this lethal condition is possible, and it should be considered as one of the differential diagnosis for polyhydramnios. Poor prognosis of this condition should be discussed with parents prior the delivery. There is still no solid evidence to the cause of this rare condition.

Complex invariably associated with fetal death. There are few proposed teratogenic effects as the cause for otocephaly such as exposure strepnigrin antibiotics and trypan blue, theophylline [7]. In our case there was no such exposure identified. The genetic basis of otocephaly is still largely unclear. Even though otocephaly is a lethal syndrome there are cases on successful management of otocephalic babies after birth. Enteral feeding was successful in such new-borns with isolated agnatia with nasogastric tubes [6].

References

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