This case shows a extra-axial mass that invades the dura and the adjacent skull. The differential diagnosis must be considered between an atypical meningioma and a hemangiopericytoma.

Distinguishing an atypical meningioma from a hemangiopericytoma is difficult on imaging. When a large mass such as this invades bone, giving both as a differential is prudent. 

Unfortunately there was no feedback of this patient's final diagnosis.