Subclavian artery aneurysm is usually rare. We report a case of a right subclavian artery aneurysm with infective endocarditis. A 36-year-old woman was admitted at our hospital due to a cerebral embolism. The echocardiogram showed severe mitral regurgitation with vegetation, and computed tomography (CT) revealed an intrathoracic right subclavian artery aneurysm. The 59×39 mm-sized mass was located distal to the vertebral artery. Mitral valvuloplasty, tricuspid annuloplasty, and aneurysm surgery with extra-anatomical bypass were performed simultaneously. The aneurysm was resected through a median sternotomy and right supraclavicular and subclavicular incisions. Revascularization with transthoracic aorto-axillary extra-anatomical bypass was also performed. The postoperative course was uneventful with no noted complications.
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