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In this presentation, various types of EC-IC bypass for the posterior circulation are presented.Especially subtemporalsuperficial temporal artery-supracerebellar artery STA-SCA bypass, paramediansuboccipitaloccipital artery-posterior inferior cerebellar artery OA-PICA bypass and occipital artery posterior cerebral artery OA-PCA bypass and/or OA-SCA bypass via the.