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meningioma

Pronunciation: me-nin'je-o'ma

Definition: A benign, encapsulated neoplasm of arachnoidal origin, occurring most frequently in adults; most common form consists of elongated, fusiform cells in whorls and pseudolobules with psammoma bodies frequently present; meningiomas tend to occur along the superior sagittal sinus, along the sphenoid ridge, or in the vicinity of the optic chiasm; in addition to meningothelial meningioma, fibrous, transitional, metaplastic, psammomatous, secretory, clear cell, papillary, rhabdoid, chordoid, lymphoplasmocytic, angiomatous, microcystic, rhabdoid, atypical, and anaplastic varieties are recognized.

[mening- + G. -oma, tumor]

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© Copyright 2017 Wolters Kluwer. All Rights Reserved. Review Date: Sep 19, 2016.
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