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In achalasia with esophageal compression, no lumen obliterating contraction occurs but the esophagus empties by a global contraction in conjunction with some degree of shortening. Radiographically, there is no esophageal retention and minimal if any dilatation. In spastic achalasia, there is a lumen obliterating spastic contraction often visualized radiograpically as a corkscrew esophagus.
