A rare case of a type 2 proatlantal artery discovered following the rupture of a cerebral aneurysm in a 74-year-old female is reported. The aneurysm was clipped and the hematoma removed, but she died of severe vasospasm 9 days after surgery. The anomalous artery was thought to have been unrelated to rupture of the aneurysm.
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KUROSE et al. (1990) studied this question.