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An anomalous origin of the right coronary artery (RCA) is a rare congenital anomaly. If it runs between the pulmonary artery and aorta, it may cause acute myocardial infarction (AMI) and sudden death.1-4) Identification of coronary anomalies is sometimes difficult by coronary angiography because of the lack of three-dimensional information. A 34-year old male patient presented with an inferior wall AMI. Coronary angiography showed that the RCA originated from the left sinus of Valsalva close to the left main coronary artery (Fig. 1). Coronary spasm was considered as the etiology of the AMI. Ten months after the first attack, the patient was readmitted due to an inferior wall AMI. Multidetector computed tomography (MDCT) showed that the RCA originated from the left sinus of Valsalva, and ran between the aortic root and the main pulmonary trunk (Fig. 2A). The axial image showed an acute-angled takeoff of the RCA from the ascending aorta and a small orifice of the RCA which was thought to be the main mechanism for the ischemia (Fig. 2B). Findings during surgery showed the RCA ostium with a small slit-like orifice that originated at the left sinus of Valsalva with an acute angle and the proximal portion of the RCA was located beside the commissure, between the right and left cusps, which were embedded in the aortic wall (Fig. 2C). After the operation, MDCT and coronary angiography showed good patency of the RCA and the patient was doing well and was free of symptoms (Fig. 2D and E). Our case showed that when a coronary anomaly, especially an anomalous origin of the RCA, is noted on coronary angiography, MDCT may provide important information about ischemic mechanisms.