Table 1.

Summary of key imaging features of embryonal tumors.

Tumor Type	Common Location	Key MRI Features
Medulloblastoma	Exclusively posterior fossa Most commonly in fourth ventricle/cerebellar vermis (non-WNT, non-SHH, or WNT), can involve cerebellopontine angle (WNT) or cerebellar hemispheres with extra-axial extension (SHH)	Diffusion restricting Variable enhancement Cystic/necrotic change may be present Calcifications uncommon Taurine peak characteristic
Atypical teratoid/rhabdoid tumor	Posterior fossa (slightly more common) or cerebral hemispheres May be extra-axial	Diffusion restricting Enhancement usually present More heterogenous than medulloblastomas, with cysts/necrosis, calcification, and hemorrhage
Supratentorial embryonal	Cerebral hemispheres or deep nuclei, rarely intraventricular	Large tumor Diffusion restricting solid components Variable cysts/necrosis and hemorrhage