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Hourglass Stomach, a stomach more or less completely and permanently divided into two parts, so that it resembles an hourglass in shape; the deformity is due to scarring which complicates gastric ulcer or neoplasia. Retraction of the gastric wall adjacent to lesser-curve ulcers may lead to the formation of smooth, symmetric folds that radiate from the ulcer crater. The opposite wall may also be retracted; this produces an incisura of the greater curvature and, ultimately, an hourglass stomach.