Aortic Sinus Aneurysm Communicating with the Main Pulmonic Artery, and a concurrent Patent Ductus Arteriosus, in a Dog

This is the first report of an aortic sinus aneurysm with a communication to the main pulmonary artery, resulting in left-to-right shunting, diagnosed in vivo in a dog. A second left-to right-shunt through a patent ductus arteriosus was also present. Computed tomography angiography was used to confirm the presence of both congenital anomalies and assess the relative contributions of the two left-to-right shunts to left-sided volume overload.