Single coronary artery involving the origins of the ADA and right coronary artery (RCA). A: Single coronary artery (CA) originating from the right sinus of Valsalva; origin of the ADA (arrow) showing its course anterior to the aorta. B: RCA and ADA. C: Single CA originating from the right sinus of Valsalva, giving rise to the RCA and ADA. The ADA presents an intramyocardial course anterior to the aorta.