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   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]
Manning K. Intermittent At-Home Suctioning of Esophageal Content for Prevention of Recurrent Aspiration Pneumonia in 4 Dogs with Megaesophagus. J Vet Intern Med 2016;30:1715 [Web Reference]
Wilson D. Risk factors for the development of aspiration pneumonia after unilateral arytenoid lateralization in dogs with laryngeal paralysis: 232 cases (19872012). JAVMA 2016;248:188 [Web Reference]
Hague DW. Risk Factors and Outcomes in Cats with Acquired Myasthenia Gravis (20012012). J Vet Intern Med 2015;29:1307 [Web Reference]
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