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Between 1993 and 2003, we treated 21 patients with cystic meningioma (of 365 with meningioma, 5.5%). We grouped these patients according to classifications by Nauta and Rengachary and analyzed them by gender, age, tumor location, clinical manifestations, MRI features and histopathology. The mean duration of symptoms was relatively short at 1.6 months. There were five atypical and 16 benign meningiomas...