Aortic injection study in a dog with insignificant aortic regurgitation (arrow) and normal coronary arteries.

Continued aortic injection study in the dog with insignificant aortic regurgitation. The short left coronary artery originates from the dorsocaudal sinus of Valsalva then bifurcates into the left circumflex (LCx) and paraconal (Pc) arteries. The subsinuosal (Ss) artery is a terminal branch of the LCx. The coronary sinus (CS) is opacified after myocardial circulation.