Abstract
The anomalous aortic origin of coronary arteries has various patterns. It requires aortocoronary bypass in some cases, but there are also cases of slight anomaly of coronary arteries which are without clinical symptoms, requiring no surgical treatment. We performed preoperative coronary angiography in case of mitral valve prolapse and found an anomalous cirumflex origin of the left coronary artery. The circumflex originated from the right coronary artery, ran antero-inferiorly to the left and branched out into the obtuse marginal. Compression stenosis and organic stenosis of coronary arteries were absent. After mitral valve replacement, rupture of the chorda tendinea was noted.
