Figure 28a. 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.