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Two cases of anomalous origins of left coronary artery with a course between the aortic root and the free standing subpulmonary infundibulum on CT coronary angiography

Department of Radiology, Jaslok Hospital and Research Centre, 15, G Deshmukh Marg, Mumbai 400026, India

*Corresponding author. Tel.: +91 22 5657333,+91 22 26420191; fax: +91 20 25231662.

E-mail address: amogh77{at}yahoo.co.in (A.N. Hegde).

Two cases of anomalous origins of the left coronary artery have been demonstrated on a CT coronary angiogram. In one case the left main coronary artery arose from the right aortic sinus of valsalva, separate from the right coronary artery. In the second case there was a single coronary artery arising from the right aortic sinus of valsalva. In both these rare cases, the left main coronary artery traversed between the aortic root and the freestanding subpulmonary infundibulum and then divided into its regular branches. These cases show well, the left main artery actually coursing free of the crista supraventricularis portion of the outlet septum. This is contrary to the commonly used classifications and descriptions, which describe the anomalous coronary artery actually traversing through the outlet septum.

Key Words: Anomalous; Single coronary artery; Subpulmonary infundibulum