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Left circumflex artery supplying the territory of right coronary artery: an extremely rare variant of a congenital single coronary artery

A 68-year-old woman presented with exertional retrosternal chest pain with radiation to the left arm, of 1-week duration. Medical history revealed a history of bronchial asthma. Family history was negative for heart disease. The patient's blood pressure was 138/80 mm Hg and her heart rate was 68 bpm. Cardiovascular and chest examination were unremarkable. A resting electrocardiogram displayed normal sinus rhythm without any ST-segment abnormalities. Transthoracic echocardiography demonstrated normal biventricular function and normal regional wall motion. Treadmill test was positive for inducible ischaemia at low workload. Laboratory testing was unremarkable. Coronary angiography showed a left anterior descending coronary artery (LAD) arising normally from the left coronary sinus …