Case #28

CT

• Mildly hyperattenuating mass in the left cerebellar hemisphere with mass effect on the fourth ventricle and resultant obstructive hydrocephalus
• No corresponding calcification

MRI

• T1 hypointense, slightly T2 hyperintense mass centered in the inferior aspect of the left cerebellar hemisphere with diffuse enhancement and mild diffuse restricted diffusion
• Crescentic cystic components along the periphery of the mass
• Mild adjacent parenchymal edema
• Corresponding mass effect with obstructive hydrocephalus at the level of the fourth ventricle and mild upward transtentorial herniation