Ectopic Meningioma



Ectopic Meningioma


Lester Thompson, MD

Cyril Fisher, MD, DSc, FRCPath









Hematoxylin & eosin shows intact respiratory mucosa overlying a syncytial-like neoplastic proliferation of meningothelial cells. The nuclei are uniform, and there are moderate amounts of cytoplasm.






The meningothelial cells are arranged in a distinctive whorled pattern, with uninvolved surface squamous epithelium image. Cell boundaries are indistinct.


TERMINOLOGY


Definitions



  • Benign neoplasm of meningothelial cells within nasal cavity, sinonasal tract, nasopharynx, or lung


ETIOLOGY/PATHOGENESIS


Pathogenesis



  • Arachnoid cells from arachnoid granulations or pacchionian bodies lining sheaths of nerves and vessels through skull foramina


CLINICAL ISSUES


Epidemiology

Jul 9, 2016 | Posted by in PATHOLOGY & LABORATORY MEDICINE | Comments Off on Ectopic Meningioma
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