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Anomalous origin of the left main coronary artery from the right sinus of Valsalva is extremely rare when not associated with other congenital cardiac anomalies. In this report we present a patient with a single coronary ostium, with both the left and right coronary artery systems arising from it. The right coronary artery was found to contain a significant flow-limiting lesion that was successfully treated with percutaneous coronary intervention.
Anomalous origin of the left main coronary artery from the right sinus of Valsalva is extremely rare when not associated with other congenital cardiac anomalies. They are seen in 0.3%–1.3% of patients undergoing coronary angiography and in 0.17% of routine autopsy studies.1 In this report we present a patient with a single coronary ostium, with both the left and right coronary artery (RCA) systems arising from it and then following their usual courses. This case was diagnosed incidentally during conventional angiography. The RCA was found to contain a significant flow-limiting lesion that was successfully treated with percutaneous coronary intervention (PCI).
A 68-year-old male was admitted to our hospital for evaluation of intermittent atypical chest pain for several months. He had a history of hypertension and diabetes. His blood pressure was 130/80 mmHg and the pulse rate was 72 beats/minute. His electrocardiography (ECG) was normal. Treadmill exercise electrocardiograms revealed ischemic changes accompanied by chest pain. Therefore, the patient was referred for coronary angiography. Selective coronary angiography was performed via the right femoral approach (Seldinger technique). Angiography showed no vessels originating from the left coronary sinus (CS). Left main coronary artery (LMCA) originating from the proximity of the RCA and dividing into left anterior descending and left circumflex artery was shown and a diffuse 70% lesion in the midsegment of the RCA, which was the presumed cause of the patient’s angina (Figure 1A, B). We performed PCI and stenting of this lesion (Figure 2).
Single coronary artery (SCA) is a rare congenital abnormality characterized by a common origin of both the right and left coronary arteries from a single aortic ostium.2 Several classification systems for coronary artery abnormalities exist. Lipton et al classified coronary variations based on origin and anatomical course relating to the ascending aorta and pulmonary trunk.3 In the present case, after its origin the main trunk divides into the right and left main arteries or into right coronary artery, left anterior descending coronary artery, and circumflex artery. The SCA anomaly is usually asymptomatic, but may present as myocardial ischemia, syncope, or sudden cardiac death depending on its course and the presence and severity of atherosclerosis.4 There is no consensus regarding the risk for atherosclerosis in SCA cases. The literature includes variable reports. Porto et al claim that there is an increased risk of atherosclerosis in the case of a single coronary artery, which may result from acute-angle take-off malformation.5 Coronary spasm, angina pectoris, and myocardial infarction are also reported in the absence of coronary stenosis.6 Gleeson et al have reported a patient with SCA from the right aortic sinus of Valsalva who had significant lesions in right coronary arteries and was treated successfully by PCI.7
We describe a rare case of a patient who had an anomaly of the left and right coronary arteries with a single coronary ostium in the right sinus of Valsalva, in which percutaneous coronary intervention was successfully performed in the right coronary artery. Selecting the appropriate guiding catheter in SCA is commonly difficult due to the tortuous angle and unusual direction of the coronary artery. In addition, if a dissection occurs, it may extend retrogradely and involve the origins of the LMCA and RCA, and the consequences may be serious. Therefore, selecting the appropriate guiding catheter and other equipment is essential to the technical success of the procedure.
No conflicts of interest were declared in relation to this paper.