Extra-axial tumor with extension through the skull: atypical meningioma vs hemangiopericytoma

Discussion:

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. 

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