Congenital immature teratoma of the central nervous system: three case reports with literature review.

Three cases of congenital immature intracranial teratomas were examined by autopsy. The fetuses were diagnosed prenatally as macrocephalic and hydrocephalic due to skull-occupying lesions. These fetuses were born alive at 32, 31, and 36 weeks gestation, respectively, via Cesarean section. Intracranial teratoma in the first case was diagnosed by MRI and in the second and third cases by ultrasound. All tumors were deemed to be unresectable. Congenital CNS teratoma should be considered in the differential diagnosis of fetuses diagnosed with macrocephaly or hydrocephaly.