Figure 2From: Multidetector-row computed tomography of thoracic aortic anomalies in dogs and cats: Patent ductus arteriosus and vascular ringsVolume-rendered 3-dimensional MDCT reconstruction of a patent ductus arteriosus. The patent ductus arteriosus (PDA) connects the descending aorta dorsally to the main pulmonary artery. Ao = aorta, PA = pulmonary artery.Back to article page