= highly malignant variant of germ cell tumors

Types:

1. Choriocarcinoma
2. Embryonal cell carcinoma
3. Endodermal sinus tumor

Histo: arising from primitive germ cells, frequently containing more than one cell type

Age:<20 years; males

• Parinaud syndrome
• tumor markers elevated in serum + CSF
• intratumoral hemorrhage (esp. choriocarcinoma)
• invasion of adjacent structures
• intense homogeneous contrast enhancement

Cx: seeding via CSF