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Background: Coronary artery anomalies are typically congenital, though they may remain undetected until routine cardiac catheterization is performed. With a detection rate of only 1.3%, these anomalies often go unnoticed. In rare cases, the right coronary artery may originate from the left coronary system, but this anomaly is generally benign. Case presentation: A 55-year-old male patient was diagnosed with NSTEMI and underwent coronary angiography. However, despite multiple attempts, the medical team could not cannulate into the right coronary ostium. The left coronary ostium was located in the left sinus of Valsalva. Selective left coronary arteriography revealed normal courses of the left main and LAD but identified a critical stenosis in the LCx and a possible CTO at the RCA ostium. The patient received a stent in the LCx and returned the following month for another angiography, during which he received a stent in the proximal LAD. However, during cine angiography, it was found that the patient had an anomalous RCA that originated from the mid-portion of LAD, coursing anteriorly to the pulmonary artery and down to the right atrioventricular groove. Subsequent CCTA confirmed the RCA's origin from the mid-LAD. Conclusion: The report finds a rare RCA origin in the mid-LAD. The heart and its complex arterial network may be examined thoroughly, appreciate to coronary CTA, a non-invasive imaging approach. This allows for effective interventional cardiovascular therapy and is helpful for medical cardiac abnormality detection and assessment. Keyword: Anomalous Right Coronary Artery, CT Coronary Angiography, RCA from LAD, Single Coronary Artery.
Indrihapsari et al. (Sun,) studied this question.