Incidental finding on CT brain. Further imaging.
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Well circumscribed lesion in the 4th ventricle, isointense to cerebellum on T1 and hyperintense on T2. No associated edema. No enhancement (not shown).
2 case question available
This patient went on to have a craniotomy and excision of the lesion, confirming the diagnosis of a subependymoma histologically.
Typical appearances of a subependymoma in the classic location.