Bypass Graft Failure Resulting from Misidentification of the Aberrant Anatomy of a Persistent Sciatic Artery.

A persistent sciatic artery (PSA) is a rare vascular anomaly in which, in contrast to normal embryonic development, the sciatic artery does not involute. Although prone to aneurysm formation and thrombosis, this is, to our knowledge, the first case of early femoral popliteal bypass failure due to a PSA.