Fig. 2. Intraoperative findings. The azygos vein was observed caudal to the dilated esophagus (A). Traction of the aorta revealed the ductus arteriosus branching from the aorta (B). The duct was ligated at the dorsal and ventral parts with 0 silk before cutting the duct between the ligation (C). Diagrammatic representation of the ductus arteriosus and the other vessels shown from the right side (D).

AZ, azygos vein; AO, aorta; DA, ductus arteriosus; ES, esophagus.