There multiple abnormal tortuous vessels in the right ambient cistern, prepontine cistern, and right cerebellopontine angle likely representing veins draining a right posterior fossa dural AV fistula. A prominent varix indenting the right pontine hemisphere is noted, measuring 11 x 14 x 9 mm.
Prominent draining veins into the right sigmoid sinus and right cavernous sinus are demonstrated. The cisternal portion of the right trigeminal nerve lies above the varix and its larger draining veins, but is related to smaller abnormal tortuous veins in the superior aspect of the right cerebellopontine angle.
The cavernous sinuses and superior ophthalmic veins appear normal. No direct impingement of the cisternal portions of either oculomotor nerve is demonstrated.
Brain parenchyma is otherwise unremarkable. There is no abnormal diffusion restriction or abnormal susceptibility related signal loss.