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Microcystic meningioma belongs to the Grade I category of meningiomas according to the WHO classification. Meningothelial cells still retain their classic ample eosinophilic cytoplasm or can also appear vacuolated. This particular arrangement is referred as a "spider-web" appearance, and may be due to secretory activity by the tumor, cystic degeneration, ischemia or penetration of CSF into the tumor.