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MedPix® Medical Image DatabaseDisease Topic 731
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Contributor: John Herbert Rees - Uniformed Services University
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More Like This ? Vestibular schwannoma
Factoid 731 - Created: 1999-09-16 14:39:36-04 - Modified: 2007-07-09 12:11:45-04
ACR Codes: 1.3
The vestibular schwannoma (VS) is the most common neoplastic mass of the cerebellopontine angle (CPA). Over 95% of these masses are solitary and sporadic neoplasms. The remaining 4-5% are part of NF2, and in that disease are bilateral in at least 2/3 of patients. VS almost invariably enhances. Small lesions are homogeneous, larger lesions are heterogeneous due to benign cystic degeneration, and some lesions create a secondary "arachnoid cyst".

The second most common CPA mass is the meningioma, an enhancing hemispheric lesion with a broad base of dural attachment.

The third most common mass in the CPA is the epidermoid inclusion cyst.

MRI: Often isointense or slightly hypointense to brain on T1W images, they may become heterogeneously bright on T2 - usually explained by the loose or myxoid (watery) "Antoni B" areas seen histologically.

http://library.med.utah.edu/WebPath/CNSHTML/CNS187.html
http://www.uhrad.com/mriarc/mri018.htm
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Location:
Brain and Neuro 		Sublocation:
Cerebellopontine Cistern		Category:
Neoplasm, non-glial
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Prepared by: John Herbert Rees
Affiliation: Uniformed Services University - || - Author Profile
Approved by: James G. Smirniotopoulos, M.D.
Affiliation: Uniformed Services University - || - Editor Profile
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