Transcatheter embolization of a bronchial side branch of the internal mammary artery for the treatment of a coronary steal phenomenon.

We present a 58-yr-old woman with unstable angina due to a coronary steal phenomenon down a bronchial side branch draining into the pulmonary circulation, 1 yr after coronary bypass grafting. The patient was cured of angina pectoris after microcoil embolization of the bronchial side branch.