Abstract
Meningiomas account for 15% of intracranial and 25% of intraspinal benign neoplasms. 1 Rubinstein LJ Tumors of the central nervous system. in: Atlas of Tumor Pathology. Armed Forces Institute of Pathology, Washington, DC1972 Google Scholar They originate from pia-arachnoid cells, particularly those of the arachnoid villi, and are classically attached to the dura. Most afflicted patients are women in the fourth and fifth decades of life. 2 Coulson WF Surgical Pathology. in: Lippincott, Philadelphia, PA1988: 1550-1551 Google Scholar Grossly, meningiomas are generally well-circumscribed lesions with a sharp delineation from the surrounding structures. However, firm adherence to the dural site of origin is the rule rather than the exception. Uncommonly, meningiomas show direct dural invasion. Although osseous invasion is noted infrequently, adjacent hyperostosis often is demonstrable on computed tomographic (CT) scanning. A variety of histologic variants exist; however, biologic behavior and prognosis are noted to be similar for all subtypes of benign meningiomas, making these distinctions of low clinical significance. 3 Kepes JJ Meningiomas. in: Masson, New York, NY1982: 100-105 Google Scholar
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