Ependymal rests and subcutaneous sacrococcygeal ependymoma.

A 2 cm subcutaneous ependymoma was resected from the natal cleft of a 4-yr-old girl. The coccyx was not removed and there has been no recurrence in 14 years. A study of the post-coccygeal region in 15 control infants revealed subcutaneous islands of ependyma, unconnected with the cauda equina, in 4/4 infants with post-anal dimples and in 6/11 infants with no external post-coccygeal anomaly.