Case #41

CT

• Cystic mass in the left cerebellar hemisphere with a solid mural nodule posterosuperiorly
• No corresponding calcification
• Associated mass effect on the fourth ventricle and obstructive hydrocephalus with subependymal edema

MRI

• Cystic mass in the left cerebellar hemisphere with an enhancing mural nodule along its posterosuperior margin abutting the left tentorial leaflet
• Susceptibility artifact in the mural nodule, which may relate to internal vascularity
• No corresponding restricted diffusion
• Minimal rim of surrounding parenchymal edema
• Associated mass effect on the fourth ventricle and obstructive hydrocephalus with subependymal edema