Abstract
neurysms arising from the posterior inferior cerebellar artery (PICA) are fortunately infrequent. Their incidence A varies from 0.49% to 3% of all intracranial aneurysms in various published studies (1-8). Typically, most of PICA aneurysms originate from the PICA-vertebral artery junction. Only a small proportion of these aneurysms (<1%), which are called distal PICA aneurysms, arise from more peripheral segments of this tortuous artery (1, 8). Understanding the complex anatomy of this artery is absolutely critical to choosing the best surgical approach.
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