Abstract:We previously reported an unusual case of bilateral posterior inferior cerebellar artery (PICA)-anterior inferior cerebellar artery (AICA) anastomosis associate with a ruptured aneurysm. Moreover, also this case had segmental absence of both distal vertebral arteries (VA). During the 7 to 12 mm embryonic stage, the basilar artery is formed by fusion of the longitudinal neural arteries. The VAs is formed by fusion of multiple segmental arteries, from C1 to C6. Inferior cerebellar arteries develop later than VAs… Show more
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