megaesophagus (redirected from Mega-esophagus)

megaesophagus /mega·esoph·a·gus/ (-e-sof´ah-gus) see achalasia.

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meg·a·e·soph·a·gus (mg--sf-gs)

n.

Abnormal enlargement of the lower portion of the esophagus, as seen in patients with achalasia.

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megaesophagus

chronic dilatation and atony of the body of the esophagus, usually associated with asynchronous function of the esophagus and the caudal esophageal sphincter. It occurs sporadically in cattle, horses and cats, but is most common in dogs. It is usually a congenital condition, causing accumulation of food and saliva and regurgitation and aspiration pneumonia from an early age but may also be secondary to systemic disease, particularly general neuromuscular disorders such as myesthenia gravis. An inherited basis is suspected in dogs. Vascular ring anomaly and a defective local neuromuscular plexus are listed pathogeneses.

Megaesophagus in a dog.