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Wikipedia

Meningioma

Meningiomas are a diverse set of tumors arising from the meninges, the membranous layers surrounding the central nervous system. They arise from the arachnoid "cap" cells of the arachnoid villi in the meninges. These tumors usually are benign in nature; however, a small percentage are cancerous. Many meningiomas produce no symptoms throughout a person's life, and if discovered, require no treatment other than periodic observation. Typically, symptomatic meningiomas are treated with either radiosurgery or conventional surgery. Historical evidence of meningiomas has been found going back hundreds of years, with some successful surgeries for their removal beginning in the 1800s.

WordNet

meningioma

n. a tumor arising in the meninges which surround the brain and spinal cord; usually slow growing and sometimes malignant

Wiktionary

meningioma

n. (context pathology English) A common tumour of the central nervous system, occurring in the meninges, usually benign.

Usage examples of "meningioma".

At craniotomy there was found, not a meningioma as had been hoped, but a huge carcinoma involving the orbitofrontal aspects of both frontal lobes.

The meningioma was on the right side of her face, extending from the bridge of her nose and over the cheek, forming a bulbous purple mass, punctuated by scars where it had ulcerated over the years.

At craniotomy there was found, not a meningioma as had been hoped, but a huge carcinoma involving the orbitofrontal aspects of both frontal lobes.