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Marked enlargement of the right cerebellar hemisphere without a focal mass or cystic change. The hemisphere is isointense on T1 and hyperintense on T2 weighted images with no abnormal enhancement. There is marked positive mass effect in the posterior fossa which is enlarged. The fourth ventricle is effaced and there is prominence of the lateral ventricles (best seen on coronal T2).
These findings are characteristic of Lhermitte-Duclos-Cowden syndrome.