Aplasia Cutis Congenita
Tollefson MM – Aplasia cutis congenita (ACC) is a rare disorder that is estimated to affect approximately three newborns in every 10,000 live births. It is usually detected at birth and most commonly affects the scalp as a solitary lesion. The type of lesion may be classified into one of nine groups. Membranous types and those with a “hair collar” are at highest risk to be associated with underlying neurodevelopmental abnormalities.