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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Stud earrings are not synonymous with post earrings; studs are earrings that do not extend below the earlobe. Some post earrings may have a post backing, yet still dangle below the earlobe similar to earrings on a curved wire.