title: Anomalous origin of the left main coronary artery from the right anterior aortic sinus: angiographic definition of anomalous course.
abstract: Five cases of anomalous origin of the left main (LM) coronary artery from the right anterior aortic sinus are presented. In 4 patients the anomalous artery ran a septal course through the floor of the right ventricular infundibulum and in 1 an interarterial course between the aorta and pulmonary trunk. The cineangiographic features of these courses are contrasted with arteries running anterior free wall and retro-aortic courses. A caudal anterior loop of the anomalous LM coronary artery indicates a septal course, a cranial posterior loop an interarterial course, a cranial anterior loop an anterior free wall course and a caudal posterior loop a retro-aortic course. Review of previously documented cases shows that the septal course is relatively common, although previously not recognized.
mesh_terms: D000328:Adult; D000368:Aged; D001027:Aortography; D002648:Child; D002932:Cineangiography; D017023:Coronary Angiography; D003330:Coronary Vessel Anomalies / Q000000981:diagnostic imaging* / Q000473:pathology; D003331:Coronary Vessels / Q000473:pathology; D005260:Female; D006352:Heart Ventricles / Q000000981:diagnostic imaging; D006801:Humans; D008297:Male; D008875:Middle Aged; D012850:Sinus of Valsalva / Q000002:abnormalities* / Q000000981:diagnostic imaging / Q000473:pathology