Case #58

CT

• Hyperattenuating mass centered in the left cerebellar hemisphere and vermis with adjacent parenchymal edema
• Small cystic components
• Associated obstructive hydrocephalus at the level of the fourth ventricle with subependymal edema

MRI

• Solid mass with small cystic components centered in the left cerebellar hemisphere and vermis, extending inferiorly into the posterior aspect of the foramen magnum. The mass measures 5.5 x 3.5 x 4 cm
• The solid components of the mass avidly enhance and demonstrate restricted diffusion
• Surrounding parenchymal edema and local mass effect with effacement of the fourth ventricle and obstructive hydrocephalus with subependymal edema