Abstract
Meningiomas are in most cases benign tumors. They represent about 15% of primitive intracranial tumors. Complete surgical resection achieves healing in the majority of patients. Recurrences occur in 9 to 12% in spite of that kind of surgical resection in the initial approach. This percentage rises to 40% when removing was not complete. Recurrences sometimes show histological changes into aggressiveness, and even malignization. Two cases of originally benign meningiomas with several recurrences and progressive aggressive behaviour are presented. Both cases led to extracranial extension of the lesions, even passing through synthetic dural grafts (De Bakey's Dacron Fabric-Elastic) and the Titanium mesh covering the craniectomy.
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