3 month old Labrador Retriever

Discussion

The hereditary myopathy predisposed this puppy to megaesophagus, and the intussusception was a complication. The filling defect in the caudal esophagus was confirmed by the vertical gas-soft tissue interface on plain films, and the filling defect in contrast on the esophagram with contrast dissecting between the esophageal wall and stomach. A hiatal hernia would simply push the esophagus more cranially in the caudal mediastinum. The rugal folds were visible because they were actually facing the esophageal wall, not because there was contrast within the stomach lumen.