Meningioma - cystic

Case contributed by A.Prof Frank Gaillard
CT

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

MRI

MRI through the posterior fossa demonstrates 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. 

Histology

Sections show a cellular tumour with the histologic features of meningioma. The tumour cells show uniform nuclei without mitotic activity and are arranged in interlacing bundles with occasional formation of whorls. Rare psammoma bodies are identified.

FINAL DIAGNOSIS: meningioma

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Case information

rID: 4718
Published: 2nd Oct 2008
Last edited: 16th Jul 2018
Inclusion in quiz mode: Included

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