Meningioma

These images show a large T2 hyperintense, multi-septated, cystic, extra-axial mass along the right frontal convexity with significant mass effect on the subjacent brain, but no evidence of edema. This indicates a slow growing process and is compatible with a meningioma. Of importance from a surgical standpoint, there is no evidence of superior sagittal sinus infiltration. Meningiomas can be cystic which may represent areas of degeneration or necrosis. The differential in this case includes a hemangiopericytoma, but these are usually locally aggressive, features which are not seen in this case.