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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Hoop earrings typically have a wire that goes through the ear and secures the front of the earring to the back. They can also use a straight post. Hoop earrings come in a variety of sizes and thicknesses. While they are usually round, they can be other shapes as well.