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Round intra-axial lesion with a diameter of 2.4 cm in the right cerebellar hemisphere, containing mixed contents and displaying ring enhancement after contrast injection. Perilesional edema with mass effect manifesting as narrowing of the fourth ventricle on the right. The midline is preserved.
No evidence of venous sinus thrombosis.
Total opacification of the right middle ear and mastoid air cells, with erosion of the posterior mastoid wall.
In summary: Right otomastoiditis with posterior mastoid wall erosion, resulting in abscess formation in the right cerebellar hemisphere.