[Factors contributing to recurrence of intracranial meningiomas and indications to postoperative radiotherapy]. / Czynniki sprzyjajace odrostowi oponiaków wewnatrzczaskowych i wskazania do pooperacyjnej radioterapii.

The incidence of various histological subtypes of intracranial meningiomas and recurrences was examined in 565 patients with surgically treated meningiomas in the Department of Neurosurgery in Poznan, between 1960-1992. Approximately 60% of the tumours were located on the convexity (39.5%) and parasagitally (23%). Histological diagnosis in 88% of the patients was endotheliomatous (61%), fibroblastic (17%) and angiomatous (10%) meningiomas. The incidence of recurrence after complete removal of the meningioma was 7% for all sites, but much higher after partial removal. Among the recurrences, there was a higher degree of malignant and angiomatous subtypes. Surgery is the accepted form of treatment for meningiomas but it may prove insufficient as the only method of therapy in certain situations. Implications for the potential role of postoperative radiation therapy are discussed.