Unusual case of single coronary artery: questions of methods and basic concepts.

Coronary artery anomalies continue to constitute a confusing subject in modern cardiology. While most anomalies are considered to have a benign prognosis, the literature and cardiologic culture frequently imply an intrinsic, systematic association of coronary anomalies with severe clinical presentations. We present a case of unusual single coronary artery, in order to elucidate the logical process that should be used to study similar cases. A 56-year-old female presented with a 6-year history of atypical chest pain and an abnormal electrocardiogram. Heart catheterization revealed an abnormal coronary tree interpreted by some observers as a benign coronary anomaly, by others to indicate the need for coronary angioplasty. A nuclear stress test was performed after 1 year of unrelenting symptoms and showed mildly abnormal findings, leading to a more definitive angiographic study that clarified the anatomy and the prognosis. The case is essentially and only an example of single coronary artery with origin of all branches from the right coronary sinus, but with an unusual triple origin of the branches serving the left anterior descending territory. The notion that a case of single coronary artery may have significant prognostic and clinical repercussion is frequently repeated in the current inconclusive literature. A rational discussion should deal both with individual case objective evidence and theoretical general consideration.