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Figure 28b. Schatzki ring. (a) Prone RAO spot image from single-contrast phase of esophagography shows Schatzki ring as smooth, symmetric, ringlike constriction (white arrow) in distal esophagus directly above a hiatal hernia (black arrows). (b) Upright LPO spot image from double-contrast phase of same examination shows mild narrowing of distal esophagus without demonstration of the ring because of inadequate distention of this region.
