Acrania

Acrania is a rare congenital disorder in the human fetus in which the flat bones of the cranial vault are completely or partly absent. The cerebral hemispheres develop completely but abnormally. It is frequently, though not always, associated with anencephaly. Diagnostic criteria described in the text include normal facial bones and cervical column, absence of the fetal skull, and brain tissue volume of at least one-third of normal size.

Type

Rare congenital disorder

Main feature

Flat bones in the cranial vault are completely or partially absent

Associated condition

Frequently associated with anencephaly