Esophagogastric ring; Schatzki's ring. A lower esophageal ring is a birth defect of the esophagus that occurs in a small number of people. It causes narrowing of the lower esophagus. Narrowing of the esophagus may also be caused by: Injury. Tumors.
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This is the most common type of earring back offered in the jewelry industry, requiring no screwing to put on or take off the earring. Also called a butterfly back, it can be used with any style of earring, whether it is a stud, hoop or drop.