title: Idiopathic megaesophagus in a calf: clinical and pathologic features.
abstract: A 4-month-old female Gelbvieh calf regurgitated 3 to 9 minutes after eating hay but not after eating grain or drinking water. A fiberoptic endoscopic examination and positive-contrast radiography revealed megaesophagus. The calf was euthanatized, and necropsy revealed a dilated esophagus (12 cm long) proximal to the thoracic inlet. Histologically, the major portion of the muscular layers of the esophagus was replaced by fat cells.
mesh_terms: D000818:Animals; D002417:Cattle; D002418:Cattle Diseases / Q000473:pathology*; D004931:Esophageal Achalasia / Q000473:pathology / Q000662:veterinary*; D005260:Female