Multiple meningiomas: a clinical, surgical, and cytogenetic analysis.

Eight cases of multiple meningiomas were found in our 13-year series of 148 operated meningiomas. The relative frequency, 5.4%, of multiple meningiomas observed is compared with that in the literature. The clinical presentation, surgical results, and diagnostic tools are discussed. Cytogenetic analysis was performed in five patients (eight neoplastic specimens). No specific abnormality for multiple meningiomas was found, but our results point out the different origin of each tumor and exclude cell migration through the subarachnoid space as a pathogenetic factor in multiple meningiomas.