Atypical meningioma


This case illustrate a meningioma with atypical features and venous sinus invasion. Atypical meningioma are WHO grade II tumors with an increased mitotic rate, corresponding to ~ 7% of all meningiomas and with a greater tendency to recur. 

Importantly an entirely benign meningioma (grade I) is now considered to be grade II regardless of all other features if brain invasion is demonstrated.