ST Elevation Myocardial Infarction in a Rare Variant of Single Coronary Anomaly

Authors

A 53 year-old woman with a history of hypertension, dyslipidemia, diabetes, and tobacco use presented to the emergency room with the sudden onset of chest pain. An electrocardiogram (Figure 1) revealed an inferior ST elevation myocardial infarction and the patient was referred for emergent cardiac catheterization. An initial attempt to engage the left coronary artery was unsuccessful. Nonselective injection of the left coronary sinus failed to identify a coronary ostia (figure 2). Selective angiography of the right coronary artery (RCA) revealed a single coronary trunk that gave rise to separate origins of the major coronary arteries. The left circumflex artery (LCx) reached the left atrioventricular groove by coursing anterior to the pulmonary artery. The left anterior descending artery (LAD) courses posterior to the right ventricular outflow tract (RVOT) and then intraseptally to emerge in the anterior interventricular groove. An acute RV marginal branch also wraps anterior to the pulmonary artery and then courses toward the cardiac apex parallel to the LAD just to the right of the interventricular groove. The right coronary artery was occluded beyond the origin of these vessels (figures 3,4) and was successfully stented (figure 5,6). Multislice coronary computed tomography angiography confirmed the anatomical variant and the course of the vessels (figures 7,8).==Figures==