Single coronary artery: Classification and MDCTA diagnosis

Single coronary artery (SCA) is a rare congenital anomaly. Only single coronary artery arises from the aortic trunk, by a single coronary osteum, supplying the entire heart. Multiple subtypes of this uncommon abnormality are described. It is important to know about these subtypes, since further management of the patient is decided by it. We present a case of 54 years old man, who was diagnosed with complete absence of the right coronary artery and elongated dominant left circumflex artery, extending further in the right atrio-ventricular groove (L-I type). Another case is of 45 years old woman, who presented with single right coronary artery arising from the aortic sinus and which gave branching to the smaller left coronary artery, further dividing into smaller LAD and LCX (R-IIA type).