solitary fibrous tumor (hemangiopericytoma) versus atypical aggressive meningioma with venous peritumoural bleed due to right sigmoid sinus involvement

A large lobulated low intensity extra-axial mass lesion measuring about 4.6 x 6.2 x 4.6 cm is noted epicentered at the right mastoid, squamous temporal bone, involving the superior part of petrous temporal bone, tegmen plate causing marked erosion of the inner cortex, demonstrating intense post-contrast enhancement. – likely suggestive of solitary fibrous tumor (hemangiopericytoma) versus atypical aggressive meningioma.

A large peritumoral bleed is noted in the right temporal region, apparently localized to the peritumoral CSF cleft with perilesional vasogenic edema – represents peritumoural bleed

The posterior component of the mass is impinging on the right sigmoid venous sinus causing marked extrinsic compression with involvement of the anterior wall of sinus – which could suggest likely cause of peritumoural bleed.

Recommend HPE correlation, follow up