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Mesenteroaxial volvulus, the distended stomach appears spherical on supine images. Two air-fluid levels are visible on the upright film: 1 in the fundus, which is inferior, and 1 in the antrum, which is superior. In addition, the upright image often demonstrates a beak where the esophagogastric junction is seen on normal images. If a nasogastric tube is passed, the esophagogastric junction is seen inferior to its normal location. If barium moves past the esophagogastric junction, the upside-down configuration of the stomach and the degree of obstruction can be documented.