Congenital cervical teratoma, associated with agenesis of corpus callosum and a subarachnoid cyst.

Cervical teratoma is a neoplasm composed of embryonic tissues with representation of all three germ layers. We report an extremely rare case of fetal cervical teratoma presenting at 24 weeks of gestation. A submaxillary mass and agenesis of corpus callosum were identified on ultrasonography, associated with agenesis of corpus callosum and a subarachnoid cyst.