Pediatric Supratentorial Primitive Neuroectodermal Tumor Etiology: small round blue cell tumorImaging: often big, periventricular, hemorrhage, necrosis, calcifiedMRI: little edema, solid parts T1+T2 isointense, restricted diffusion, heterogenous contrast enhancementComplications: CSF spread Radiology Cases of Supratentorial Primitive Neuroectodermal Tumor