megaesophagus


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megaesophagus

 [meg″ah-e-sof´ah-gus]
dilatation and muscular hypertrophy of most of the esophagus, above a constricted, often atrophied, distal segment. See also achalasia.

meg·a·e·soph·a·gus

(meg'ă-ē-sof'ă-gŭs, meg'ă-e-sof'),
Great enlargement of the lower portion of the esophagus, as seen in patients with achalasia and Chagas disease.

megaesophagus

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

megaesophagus

[meg′ə·isof′əgəs]
Etymology: Gk, megas + oisophagos, gullet
abnormal dilation of the lower segments of the esophagus caused by distension resulting from the failure of the cardiac sphincter to relax and allow the passage of food into the stomach. See also achalasia.

meg·a·e·soph·a·gus

(meg'ă-ĕ-sof'ă-gŭs)
Great enlargement of the lower portion of the esophagus, as seen in patients with achalasia and Chagas disease.
Synonym(s): mega-oesophagus.

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.
Enlarge picture
Megaesophagus in a dog.
References in periodicals archive ?
In animals, congenital megaesophagus and other congenital esophageal defects have been implicated as the underlying cause of GEI (1).
These cases have been reported sudden death secondary to megaesophagus.
Monty, a four-month-old Alaskan Malamute cross breed requires extra care as he suffers from a condition known as megaesophagus.
Another key part of her treatment plan is to avoid aspiration pneumonia secondary to megaesophagus (when the esophagus dilates from lack of muscle tone).
Pre-and postoperative nutritional evaluation in patients with chagasic megaesophagus.
Indeed, between 20 to 30% of Chagas-infected individuals suffer from such diseases as cardiomyopathy (enlarged heart), arrhythmia (varied heart rate or rhythm), cardiac arrest, megacolon (enlarged colon) and megaesophagus (enlarged esophagus) (Bastien, 1998; CDC, 2009).
Centre manager Sue Embleton said: ''Toby has megaesophagus, a congenital condition meaning food does not pass through to his stomach properly.
Centre manager Sue Embleton said: "Toby has megaesophagus, a congenital condition meaning food does not pass through to his stomach properly.
At this age, one might expect infected patients to show cardiac involvement caused by Chagas disease, as well as other manifestations such as megaesophagus and megacolon (3).