Olfactory groove meningiomas.

Meningiomas, usually histologically benign tumors, are originating from the arachnoidal cap cells normally present intracranially in varying sites. Olfactory groove meningeomas arise from the medline of the anterior fossa between the crista galli and the tuberculum sellae. The most common presenting symptoms are the visual field defects, epilepsy, and psychological change. They are often large before they are detected because of slowly asymptomatic growing in the interhemispheric space of the frontal lobes. This series is consisted of 29 patients suffering from olfactory groove meningiomas treated surgicaly between May 1992 and November 2003. The surgical results and complications are presented and analized, comparing them by the other reported series.