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68-year-old woman with basilar tip aneurysm.
A and B, Sagittal slab MIP (A) and 3D volume-rendered (Towne’s view) (B) images demonstrate an anterior PMV (large white arrow in A) posterior to the basilar artery (large black arrow in A). Note that the interpeduncular veins (small white arrows), which connect the anterior PMV with the basal vein of Rosenthal, are draping over the basilar tip aneurysm (small black arrows). A indicates anterior; P, posterior; S, superior; I, inferior.
