Single coronary artery with anomalous origin of right corona
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A coronary artery anomaly is a congenital defect of one or more coronary arteries of the heart in terms of origin, number, course and termination of the artery. A 69 year old lady with angina on exertion admitted to our hospital after detection ischemia of inferior segment of the left ventricle on imaging. Coronary angiography showed an isolated single coronary artery with an aberrant right coronary artery originating from distal left circumflex artery. Here we would like to attract attention to coronary abnormalies by presenting this case.

Case presentation
A 67 year old lady applied to our outpatient clinic for increasing nature of chest pain on exercise. She had hypertension for 23 years and treated with candesartan plus hydrochlorothiazide and it was well controlled. There were no history of coronary artery disease, diabetes mellitus and hyperlipidemia. Physical examination showed normal heart sounds and there were no rales in both lung areas. She had a blood pressure of 131/65 mm Hg, a heart rate of 69 bpm, a temperature of 36.9°C and a respiratory rate of 13/min. Her electrocardiogram showed sinus rhythm without any pathology. An exercise stress test was performed according to Bruce protocol which was unable to show ischemia during exercise but angina at the 6th minute. Her angina was dissolved in three minutes after rest. Gated myocardial perfusion imaging (MPI) with technetium-99m (Tc-99m) showed preserved ejection fraction with moderate ischemia in inferior wall of left ventricle from mid-ventricle to the basal segments.

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