Schatzki Ring as appeared by Endoscope and barium swallow

A Schatzki ring also called Schatzki-Gary ring is a narrowing of the lower part of the esophagus that can cause intermittent dysphagia. The narrowing is caused by a ring of mucosal tissue (which lines the esophagus) or muscular tissue.And This ring is congenital in origin.

Two rings have been identified in the distal esophagus.
1- Muscular ring, or A ring, is a thickened symmetric band of muscle that forms the upper border of the esophageal vestibule and is located approximately 2 cm above the gastroesophageal junction. The A ring is rare; furthermore, it is even more rarely associated with dysphagia.
2- Mucosal ring, or B ring, is quite common and is the subject of discussion in this topic. The B ring is a diaphragmlike thin mucosal ring usually located at the squamocolumnar junction; it may be symptomatic or asymptomatic, depending on the luminal diameter.

Endoscopic image of Schatzki ring.

Patients typically present with intermittent nonprogressive dysphagia for solids. Fortunately, most patients respond well to initial and repeat dilatation therapy. A small number of patients may have stubborn rings that require more aggressive endoscopic or surgical intervention.

This Prone, single-contrast barium esophagogram demonstrating Schatzki ring a thin, ringlike narrowing (arrows) in the lower esophagus just above a hiatal hernia. This view is most sensitive for detecting lower esophageal rings, provided adequate esophageal distention is achieved.