A fifty-two-year-old woman with angina pectoris due to coronary-subclavian steal syndrome through a left internal mammary artery graft placed distal to a left anterior descending artery stenosis is presented. Retrograde flow through the mammary artery graft due to severe left subclavian stenosis was observed angiographically. Accordingly, left subclavian balloon angioplasty was performed, restoring normal antegrade flow through the internal mammary artery graft and resulting in resolution of the patient's symptoms. The patient was subsequently discharged with no evidence of angina. Carotid-subclavian bypass surgery was avoided, reducing patient discomfort, procedural risk, and expense.
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