Abstract
Meningioma is a meningothelial (arachnoidal) cell neoplasm, typically attached to the inner surface of the dura mater. Most meningiomas are benign and correspond to WHO grade I. Certain histological subtypes or meningiomas with specific combinations of morphologic parameters are associated with less favourable clinical outcomes and correspond to WHO grade II, including chordoid, clear cell, and atypical meningiomas, and grade III, including papillary, rhabdoid, and anaplastic meningiomas. The treatment strategy for meningiomas is total removal. While benign meningiomas have recurrence rates of about 7-25%, WHO grade II meningiomas recur in 29-52% of cases and grade III meningiomas at rates of 50-94%. Thus, radiotherapy for grade II and III meningiomas after tumor removal may be needed.
