Onychopathy in a patient with fetal hydantoin syndrome.

Hydantoin is an anticonvulsant drug with several side effects. A teratogenic potential has been suggested. The fetal hydantoin syndrome is an entity that consists of a broad range of morphologic and developmental disorders in children born of epileptic mothers exposed to hydantoin during pregnancy. We treated a girl in whom onychopathy was a monosymptomatic or mild form of this syndrome.