#achalasia

Top Voted Definition for #achalasia

Achalasia is a failure of smooth muscle fibers to relax, which can cause a sphincter to remain closed and fail to open when needed. Without a modifier, "achalasia" usually refers to achalasia of the esophagus, which is also called esophageal achalasia, achalasia cardiae, cardiospasm, and esophageal aperistalsis. (Achalasia of the rectum, for instance, is Hirschsprung's disease).

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