Cystic meningioma: cerebellopontine angle

Case contributed by A.Prof Frank Gaillard

An extra-axial mass in the right cerebellopontine angle with a prominent central cyst.

MRI through the posterior fossa demonstrate an extra-axial mass in the right cerebellopontine angle with a prominent central cyst. It does not enter the internal acoustic meatus and does result in oedema in the adjacent cerebellar hemisphere. 

Features are consistent with a cystic meningioma. As the mass seems to be separate from the eighth cranial nerve, a schwannoma is thought much less likely. 

Case Discussion

This patient went on to have a resection. 

Pathology

Final diagnosis: Meningioma

Microscopic Description: Sections A1-A6 show a cellular tumor with the histologic features of meningioma. The tumor cells show uniform nuclei without mitotic activity and are arranged in interlacing bundles with occasional formation of whorls. Rare psammoma bodies are identified.

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Case information

rID: 4718
Case created: 2nd Oct 2008
Last edited: 7th Sep 2016
Inclusion in quiz mode: Included

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