Choroid plexus papilloma
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Brain MRI demonstrates a multilobulated fourth ventricular mass with cystic changes. The mass is isointense to gray matter on T1WIs, iso to hypointense on T2WIs and demonstrates avid enhancement on post contrast sequences.
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The patient went on to have a posterior fossa craniotomy and excision of the mass. This confirmed a choroid plexus papilloma.
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This is a case of pathologically proven choroid plexus papilloma. This case illustrates typical appearances of a choroid plexus papilloma in a child, although the location within the 4th ventricle is more characteristic of adult CPP. In children, it most frequently arises in the trigone of the lateral ventricles.