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Fig. 2B —42-year-old woman with double origin of left posterior
inferior cerebellar artery (PICA) and basilar tip aneurysm. Lateral (A)
and frontal (B) angiograms obtained during left vertebral artery
injection show left PICA has two origins (black arrows, A),
which converge at mid aspect of anterior medullary segment of PICA (white
arrow). Coils are evident in basilar tip aneurysm (A). Double
origin of PICA arises from slightly dominant vertebral artery.
