Great enlargement of the lower portion of the esophagus, as seen in patients with achalasia and Chagas disease.

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mega·esoph·a·gus or chiefly Brit mega·oe·soph·a·gus -i-'säf-ə-gəs n, pl -gi -.gī, -.jī dilation and hypertrophy of the lower portion of the esophagus <\megaesophagus secondary to advanced achalasia (Suil Kim )(et al)>

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mega·esoph·a·gus (meg″ə-ə-sofґə-gəs) pathologic dilatation of the esophagus; see esophageal achalasia, under achalasia.

Medical dictionary. 2011.

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