Pediatric Supratentorial Primitive Neuroectodermal Tumor

Etiology: small round blue cell tumor
Imaging: often big, periventricular, hemorrhage, necrosis, calcified
MRI: little edema, solid parts T1+T2 isointense, restricted diffusion, heterogenous contrast enhancement
Complications: CSF spread

Radiology Cases of Supratentorial Primitive Neuroectodermal Tumor

CT and MRI of supratentorial primitive neuroectodermal tumor — Axial CT without contrast of the brain (above left) shows an ill-defined large heterogenous right periventricular mass causing midline shift to the left. Axial T2 (above right) and T1 MRI without contrast (below left) of the brain show the mass to be fairly well circumscribed, primarily solid with some cystic components, and to show heterogenous enhancement on axial T1 MRI with contrast (below right).