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Question #154 (8/7/2026)

National Association of Medical Examiners 
Educational Activities Committee

Submitted by Dr. Casey Schukow (PGY-4), Dr. Michael Cantley (PGY-2) and Dr. Carolina Polanco (Faculty Pathologist), all from Corewell Health William Beaumont University Hospital, Royal Oak, Michigan, United States
1.The decedent is a male in his 70s with history of severe atherosclerotic coronary artery disease status multi-vessel bypass grafting (CABG). One of the vessels was inadvertently severed at its proximal aspect due to the local presence of severe fibrous adhesions (see gross images with thick black arrow).

Histologic images of this graft vessel are provided. What vessel is most likely depicted in this image?