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| | THE MERCK MANUAL, Sec. 3, Ch. 20, Esophageal Disorders |
 | | Esophageal dysphagia is sometimes associated with obstructive disorders (eg, cancer, benign peptic stricture, lower esophageal ring). |
 | | Dysphagia can be intermittent (eg, from lower esophageal ring), progress rapidly over weeks to months (eg, from esophageal cancer), or progress over years (eg, from peptic stricture). |
 | | Esophageal dysphagia is sometimes associated with motor disorders (eg, achalasia, symptomatic diffuse esophageal spasm, scleroderma). |
| www.merck.com /pubs/mmanual/section3/chapter20/20b.htm (484 words) |
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