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Fig. 2C —43-year-old woman presenting to emergency department with 3 hours of substernal chest pain radiating to back. Initial troponin and creatine kinase, myocardial bound tests were negative and ECG showed sinus bradycardia. 64-MDCT was performed 5 hours after emergency department presentation. RCA = right coronary artery, LAD = left anterior descending artery, IM = ramus intermedius, LCX = left circumflex coronary artery. Curved multiplanar reconstruction along centerline of RCA shows regular contrast enhancement all RCA segments and no evidence of coronary atherosclerotic plaque or luminal narrowing. Patient was discharged 29 hours after emergency department presentation without any evidence for ACS. IM artery is seen in 37% of population.