[A rare cervical malformation syndrome: mento-sternal cleft. Apropos of 4 case reports].

Midline cervical cleft and webbing is a rare congenital anomaly of the neck. A series of 4 cases is reported, among which 2 relapses. The neonatal diagnosis of the deformation leads to a surgical treatment for the first two years, associating excision of the cleft with its underlying fibrous cord, and closure with local plasty (wave-plasty, multiple Z-plasty). However, relapses are possible. They show evidence of a real regional hypoplasia that will require the contribution of tissue. Myo cutaneous flaps are used in 3 cases. The possibility of tissue-expansion is discussed. Mandibular surgery may be necessary at a later stage (genioplasty).