Abstract 55-year-old male with history of transient ischaemic attack, excised gastro-intestinal stromal tumour, and osteoarthritis presented to rapid access chest pain clinic with history of atypical chest pain. There were no resting electrocardiographic changes. In accordance with NICE stable chest pain guidelines, a CT coronary angiogram was requested to further assess for any underlying coronary artery disease. This showed normal origin of left main stem (LMS) from left coronary sinus of aorta, however there was an anomalous origin of the right coronary artery (RCA) as a branch from the mid portion of left anterior descending artery (LAD). This was deemed to be an incidental finding with a benign course and not the cause of his symptoms. Coronary anomalies have a reported incidence of 1.3% at invasive coronary angiography (1), and a reported incidence of 0.014-0.066% of single coronary artery (2). Anomalous RCA usually courses from the LMS and courses between the aorta and pulmonary artery. We present an extremely rare variant of single coronary artery arising from the mid LAD without any associated congenital or structural abnormality, on CT coronary angiography (the gold standard for demonstrating coronary anatomy). This is rarely reported in the literature and is a benign coronary anomaly. Abstract P1487 Figure.