Meningioma - petrous apex


The patient went on to have surgery.


Sections show an intensely vascular tumor composed of whorled meningothelial cells. The tumor cells demonstrate indistinct cell borders, abundant pale eosinophilic cytoplasm, oval nuclei with fine granular chromatin and focal intranuclear inclusions. No necrosis or mitoses are identified. No brain tissue is included. 

DIAGNOSIS: Meningothelial meningioma, WHO Grade I.