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A) Tumour in situ (B) Tumour removed (C) CT head post-op, no residual tumour


(A) Intraoperative smear showing typical whorl formation. (B) Hematoxylin-Eosin stain, combination of fascicular pattern and whorling.
Meningiomas arising in ventricles from choroid plexus arachnoid cells are rare (1% of all meningiomas ) and usually present in the trigone of lateral ventricles. Development from choroid elements in the 4th ventricle is very rare.

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Volume 18 - number1 - Bibliothèque nationale, ISSN 1180-0844 National Library of Canada, Production - Denis Melanson -Neurikon Inc. Layout, Graphic Design, and some Photography by the Department of Neurophotography at the Montreal Neurological Hospital (05-2002)
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