Abstract
We present a case of an anomalous right coronary artery (aRCA) from the left sinus of Valsalva, which is a rare congenital anomaly. A 69-year-old man was evaluated in our hospital for precordial discomfort. On coronary angiography, the left coronary artery was normal and there was good collateral connection from the left anterior descending artery to the right coronary artery (RCA). The existence of the collateral artery suggested a severely stenotic or occlusive RCA, but the orifice of RCA was not detectable by various diagnostic catheter procedures and aortography. Multislice computed tomography (MSCT) revealed a totally occlusive lesion at the proximal portion and significant diffuse narrowing in the mid to distal portion or aRCA. Percutaneous coronary intervention for aRCA was undertaken with reference to the MSCT findings. In this case, MSCT was very useful to detect aRCA and as a convenient complementary tool for the intervention.
