Description    Megaesophagus results from an esophageal motor disorder causing hypomotility. The congenital form is noticed after weaning and is hereditary. Onset of the acquired form might be at any age and has been associated with viral encephalitis, Lead Poisoning, Thymoma, Myasthenia Gravis, Immune Mediated Polyneuritis, Systemic Lupus Erythematosus, Polymyositis, Hypothyroidism, Hypoadrenocorticism, Myotonia, Trauma, Tick Paralysis, Muscular Dystrophy, various neuropathies and many other causes. There is often secondary pneumonia.
Species   Canine, Feline
Signs   Abnormal breath odor, Abnormal lung or pleural sounds, Abnormal upper airway breathing sounds, Anorexia, Coughing, Dehydration, Dullness, Dysphagia, Dyspnea, Erythema, redness of pharynx, Excessive salivation, Fever, Gagging, retching, Generalized weakness, Increased respiratory rate, Lack of growth or weight gain, Mucoid nasal discharge, Polyphagia, Purulent nasal discharge, Sneezing, Tetraparesis, Underweight, poor condition, thin, emaciated, unthriftiness, ill thrift, Vomiting or regurgitation, Weight loss
References   Kopke MA. Carcinoma in situ within an area of Barrett esophagus in a dog with megaesophagus. J Vet Diagn Invest 2018;Jun [Web Reference]
Cinti F. Aberrant right subclavian artery causing megaoesophagus in three cats. J Small Anim Pract 2018;May [Web Reference]
Gershwin LJ. Current and Newly Emerging Autoimmune Diseases. Vet Clin North Am Small Anim Pract 2018;48:323 [Web Reference]
Robin EM. Esophageal leiomyoma in a dog causing esophageal distension and treated by transcardial placement of a self-expanding, covered, nitinol esophageal stent. JAVMA 2018;252:330 [Web Reference]
Sherman R. Aspiration Pneumonia in the Dog: A Review. Topics Companion Anim Med 2017;32:1 [Web Reference]
Quintavalla F. Sildenafil improves clinical signs and radiographic features in dogs with congenital idiopathic megaoesophagus: a randomised controlled trial. Vet Rec 2017;180:404 [Web Reference]
Kanemoto Y. Long-term management of a dog with idiopathic megaesophagus and recurrent aspiration pneumonia by use of an indwelling esophagostomy tube for suction of esophageal content and esophagogastric tube feeding. J Vet Med Sci 2017;79:188 [Web Reference]
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