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CASE NUMBER
11
Diagnosis
Arachnoid Cyst
Note
There is a circumscribed cystic lesion along the posterior aspect of the right cerebellar hemisphere that follows CSF signal on all sequences, consistent with an arachnoid cyst. Arachnoid cysts are most commonly found in the middle cranial fossa, but may arise in a variety of locations. Epidermoid cysts are in the differential of cystic intracranial lesions and will classically demonstrate restricted diffusion and incomplete suppression of signal on FLAIR.
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