Basal ganglia teratomas: report of three cases.

Three cases of intracranial teratomas occurring at the basal ganglia of three young male patients were reported. Their radiologic appearances closely resembled each other with multicystic tumor masses located deep in the basal ganglia. Histology showed teratocarcinoma, combined immature teratoma and germinoma, and teratoma with malignant transformation. These tumours represent a distinct clinico-radiologic group of lesions and serve as an addition to the dearth of information reported about the histological subtypes of intracranial teratomas.