MR imaging features of clear-cell meningioma with diffuse leptomeningeal seeding

Clear-cell meningioma is a rare disease entity showing a more aggressive na ture, clinically, than those of other subtypes of meningioma. It occurs in younger persons and commonly in the spinal canal. The recurrence rate has b een reported to be as high as 60%, We present a ease of clear-cell meningio ma in a 17-year-old man in whom initial MR imaging showed localized leptome ningeal enhancement that had progressed into the entire subarachnoid space after surgical resection of the primary tumor.