Megaesophagus caused by congenital heart disease.
D000818:Animals; D004283:Dog Diseases / Q000209:etiology; D004285:Dogs; D004374:Ductus Arteriosus, Patent / Q000150:complications / Q000662:veterinary*; D004931:Esophageal Achalasia / Q000209:etiology / Q000662:veterinary*; D008297:Male