Abstract
Median cleft deformities of the lower lip and mandible are very rare congenital anomalies. Our patient had median cleft of the lower lip, mandible, and the chin with tongue duplication, ankyloglossia, and cleft strap muscles with 2 neck contracture bands. This anomaly was associated with congenital heart disease transposition of great vessels, large ventricular septal defect, and severe pulmonary stenosis. Early repair was done at 6 months to improve feeding.
Introduction
Median cleft of the lower lip and mandible is a very rare craniofacial anomaly. Couronné (1819) was the first author to report this abnormality. In 1976, Paul Tessier introduced the number system for craniofacial clefts, wherein the mandible midline cleft was notified as no. 30. They are considered as caudal extension of no. 14 (cranial) and no. 0 (facial cleft; Tessier, 1976). Oostrom et al., (1996) reviewed the literature and found a total of 65 reported cases, including 3 cases of their own. Few cases have been published since that time.
Principle features of median cleft deformities of the lower lip and mandible are as follows: (1) complete median cleft of the lower lip with extension of cleft may vary from a simple notch in the vermilion to a complete cleft involving the tongue, lower lip, chin, and extending up to the cervical region for varying distance; (2) notching of the mandible to complete cleft of the mandible allowing independent movements of the mandibular segments; (3) anomaly of the tongue including bifid tongue and tongue tie; and (4) associated features such as lack of hyoid bone, thyroid cartilage, and even manubrium sterni. Different malformations in other organs such as heart, limbs, and internal organs are also reported concomitant with Tessier 30 (Surendran and Varghese, 1991; Ladani et al., 2013). A review of the literature about some reported cases is presented in Tables 1 and 2.
Clinical Findings of Previously Reported Cases.
Abbreviations: ASD, atrial septal defect; CT, computed tomography; PDA, patent ductus arteriosus; VSD, ventricular septal defect.
Surgical Treatment and Results of Previous Reported Cases.
Case Report
The patient was referred to our department from pediatrics department when he was 5 days old. His mother complaints of facial deformity, difficult feeding (inability to suckle), and sometimes choking. He was the first baby. There was no admission to neonatal intensive care unit. There was no exposure of the mother to radiation and teratogens during pregnancy. The baby was born by normal vaginal delivery at full term. There was no consanguinity between the parents. The pediatrician had examined the baby before and he advised the parents to do echocardiography to reveal any congenital heart anomalies. The echocardiography revealed transposition of great vessels (TGAs), large ventricular septal defect (VSD), and severe pulmonary stenosis (PS).
On clinical examination, there were median cleft of the lower lip, full thickness up to the chin with duplication of the tongue that was stuck to the cleft margins of the lower lip and the mandible, and cleft strap muscles with 2 neck contracture bands (Figure 1). Otolaryngologist consultation showed patent airway, with no stridor or airway compromise, but with only cleft strap muscles. Endoscopic examination shows normal larynx and trachea (no hypoplasia or cleft) with right upper tracheal diverticulum and small anterior laryngocele were detected by fiber-optic endoscope examination. Radiologically, a noncontrast multislice computed tomography (NCMS-CT) showed complete median cleft of the lower jaw (mandible) and complete cleft of the tongue (duplication), associated with cleft of the skin and soft tissues of straps muscles seen at the upper part of the neck, normal hyoid bone. It also showed right upper tracheal diverticulum, small anterior laryngocele, normal thyroid cartilage, and normal upper facial bones.

When the baby was 5 days old.
The patient was 6 months old and weighed 6.5 kg when he had been referred to our department to correct the facial deformity. General anesthesia was carried out with nasoendotracheal intubation (Figure 2). Firstly, the duplicated tongue was released from the lower lip, floor of the mouth, and margins of the cleft, then a longitudinal excision of the midline cleft was made full thickness up to the floor of the mouth by 15-gauge blade, and suturing with 3-0 Vicryl to approximate the 2 halves of the tongue (Figure 3). For repairing the mandibular cleft, an incision was made along the margins of the cleft on each side full thickness including skin, muscle, and mucosa. There was continuity of skin up to the neck with no definite chin in the midline, so an incision was made to separate the lower lip from the neck, then dissection was done to separate the skin, muscle, and mucosa; through this incision, the 2 mandibular segmented were exposed. Mucoperiostium was elevated from the mandibular segment. The 2 ends of the cleft were identified on both sides. Both mandibular segments were fixed at the upper border, and the inferior border of the mandible was sutured with 2-0 Vicryl on both sides. I used strong suture instead of wire or plate because it may extend over the mandibular stump and damage tooth bud (Figure 4). Repair of the cleft lower lip was done, first we started with the mucosa inside and continuing suturing the mucoperiostium to cover the mandible with 4-0 Vicryl sutures, then repair of the muscle with 4-0 Vicryl sutures, and lastly skin repair with 5-0 Vicryl sutures. Finally, repair of the clefted strap muscles was made by release of the 2 contracted neck band, then muscle approximation with 4-0 Vicryl sutures at the midline, and skin closure by Z-plasty reconstruction to avoid neck contractures (Figure 5). The baby was admitted by the anesthethiologist to the intensive care unit postoperatively, as oxygen saturation was below 80, and then the baby was intubated with oxygen flowmeter. Follow-up showed good healing clinically (Figure 6). Good bony healing was revealed by CT.

Intraoperative intubation, baby at 6 months old.

Tongue repair.

Mandibular cleft repair.

Lower lip and chin repair.

Postoperative photo after 2 weeks.
Discussion
Typical craniofacial clefts (cleft lip and palate) are common, but atypical clefts are rare, the incidence being estimated at 1.4 to 4.9 per 100 000 live births (Resnick and Kawamoto, 1990; Sesenna et al., 2012). Median cleft of the lower lip and mandible is a rare congenital anomaly (Hou et al., 2011). Tessier (1979) described an anatomical classification system, in which the number is assigned to each craniofacial cleft on the basis of its position relative to the sagittal midline and the orbit. The first report of midline mandibular cleft was reported by Couronné (1819) (Armstrong and Waterhouse, 1996; Oostrom et al., 1996). Since then, 66 cases have been reported worldwide till 2007 (Senan et al., 2007).
Cleft of the lower lip and mandible is a developmental anomaly of the first branchial arches. Several hypotheses concerning its pathogenesis have been proposed in the literature. Most authors consider it to be due to a failure of fusion of the first pair of branchial arches or a failure of mesodermal penetration into the midline of mandibular part of the first branchial arch (Resnick and Kawamoto, 1990). Morton and Jordan (1935) feel that the second theory may explain the absence of hyoid, thyroid cartilage, strap muscles, and manubrium in severe varieties. In 1996, Oostrom et al proposed that there is only 1 branchial arch during early embryonic periods (7th week) into which 2 mandibular processes grow with a groove in midline. Hypoplasia of the mandibular processes during early embryonic period will lead to the severest cleft of the mandible extending to the neck. During the late embryonic period, less severe median clefts will develop (Ishii et al., 2002).
Thus, the deformity can range from minor to severe variety in various combinations. In minor forms, only the lower lip is clefted. Frequently, the cleft extends to the mandibular symphysis. The tongue may be bifid and attached to the cleft alveolar margin, at times to the cleft uvula and ankyloglossia (Tessier, 1976). In severe forms, epiglottis or hyoid may be absent; thyroid cartilage may be underdeveloped (Kawamoto, 1990). There may be a midline cervical cord. Strap muscles may be atrophic and represented by fibrous tissue causing bulging of the neck during straining (Ishii et al., 2002). Monroe (1966) and Ishii et al (2002) reported flexion contracture of the neck and that there may be a midline dermoid in the neck (Monroe, 1966 and Ishii et al., 2002). The clavicles may be widely spaced and manubrium sterni may be bifid or absent (Morton and Jordan, 1935). There may be presternal tags (Son et al., 2001). Seyhan and Kylyur (2001) reported a case of bifid sternum associated with subcutaneous mass and ventriculoseptal defect.
There may be other associated facial anomalies such as cleft of upper lip, cleft palate, Pierre-Robin anomaly, mucus pits of lower lip, hemifacial microsomia, and dermoid cyst of nose or chin, eye, and ear deformities (Richieri-Costa and Pereira, 1993). Congenital anomalies of heart (single ventricle, TGAs), hand (syndactyly, brachydactyly), and foot (clubfoot, ectrodactyly; Senan et al., 2007 and Sesenna et al., 2012) have also been reported. Although no genetic abnormality has been described. Subramani et al., (2000) have reported a mother having cleft tongue with ankyloglossia, linear band in the midline of palate, and hyperpigmented patch over dorsum of tongue and her daughter with cleft tongue, ankyloglossia, cleft of soft palate, notched vermilion of upper lip, and ectodermal dysplasia of face.
In our case, there was median cleft of the lower lip and chin with duplication of the tongue, ankyloglossia, and cleft strap muscles with 2 contracture neck bands associated with congenital heart disease: TGA, large VSD, and severe PS.
Similar cases with heart anomalies were reported. In 2001, Son et al. (2001) also presented a case with median cleft of the lower lip and mandible concomitant with double-inlet single ventricle. In 2013, Adetayo and Martin (2013) reported a 37-week-old infant with a Tessier 30 cleft concomitant with levocardia, perimembranous moderate-to-large VSD, patent foramen ovale, double-outlet right ventricle, intestinal malrotation, and bilateral undescended testicles. In 2015, Tafreshi et al. (2015) reported the first Iranian case of Tessier 30 of 12-hour-old boy with large VSD, a mild atrial septal defect, and a small patent ductus arteriosus. In 2015, Tapadar and Tiwari (2015) reported a case of Tessier 30 with complete tongue duplication up to the posterior part.
The rarity and variation in severity of this condition are responsible for the lack of consensus on the mode of management and timing of surgical procedures (Rantar, 1984). Millard et al., (1979) reported initial correction of a midline cleft of the lower lip at 6 months followed by closure of the mandibular cleft at 8 years of age because early closure of the mandibular defect could cause damage to the tooth buds. Sherman and Goulian (1980) treated median mandibular bone defects at 20 months of age successfully .On the other hand, Oostrom et al. (1996) said that a careful osteosynthesis of the base of the mandible does not harm these buds and may cause a better maxillomandibular relation in occlusion. They also stated that this timing should depend on the severity of the cleft.
Armstrong and Waterhouse (1996) treated lower lip cleft deformity at the age of 5 months and mandibular deformity with bone graft to correct occlusal cross bite at the age to 4 years. Chidzonga et al., (1996) followed the same protocol and treated soft tissue deformity at 1 year and mandibular segment fixed with bone graft to correct occlusal cross bite at the age of 19 months. Oostrom et al., (1996) had approximated the 2 ends of mandible with absorbable sutures in order to facilitate closure of skin at 3 month of age and planned to close the mandibular gap when the child was about 10 years old in order to preserve the growth of mandible and teeth. Ibrahim et al. (2002) treated a case of median mandibular cleft with large bony defect, with 2 hamartomatous masses on both sides of clefts. A pedicled cartilaginous mass from hamartoma was used to bridge a bone defect in primary repair at the age of 3 months.
In our case, the patient was 5 months old and weighed 5.5 kg when he was operated. The duplicated tongue was repaired firstly by release from the lower lip, floor of the mouth, and margins of the cleft, then a longitudinal excision of the midline cleft up to the floor of the mouth, and then suturing with 3-0 Vicryl for approximation. The lower lip was repaired along the margins of the cleft on each side including skin, muscle, and mucosa repair with absorbable Vicryl sutures. Then, both mandibular segments were fixed after mucoperiostium elevation at the upper border and the inferior border of the mandible with 2-0 Vicryl sutures on both sides. I used strong suture instead of wire or plate because it may extend over the mandibular stump and damage tooth bud. Finally, the repair of the clefted strap muscles was made by release of the contracted bands and muscle approximation with 4-0 Vicryl sutures at the midline, the skin was closed by Z-plasty reconstruction to avoid neck contractures. This procedure was same as previously described by Ladnai et al. (2013) for early repair of soft and hard tissues. Follow-up showed good healing clinically and good bony union by CT scan.
Conclusion
Median mandibular cleft are very rare congenital anomalies. Our patient had median cleft of the lower lip and the chin with bifid tongue, ankyloglossia, and cleft strap muscles associated with congenital heart disease. Early repair was recommended.
Footnotes
Declaration of Conflicting Interests
The author(s) declared no potential conflicts of interest with respect to the research, authorship, and/or publication of this article.
Funding
The author(s) received no financial support for the research, authorship, and/or publication of this article.
