Congenital oculo-facial paralysis (Moebius syndrome): evidence of dominant inheritance in two families.

Moebius syndrome is usually sporadic. The few familial cases reported in the literature have autosomal dominant inheritance, with absence of the associated congenital malformations often described in the sporadic form. Here we report two families with more than one member affected by congenital, unilateral paresis of cranial nerves, transmitted with autosomal dominant inheritance.