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An asymptomatic 38-year-old man was endoscopically followed because of a gastric submucosal tumor (SMT) showing a positive cushion sign in the greater curvature of the gastric antrum. The mucosal surface of SMT dramatically changed from normal to red color, whereas with a normal micro-surface pattern (figures 1 and 2). The lesion was harder with poorer mobility. The biopsy samples revealed hyperplastic and hyperemic changes without malignant findings. He had no subjective symptoms or abnormal blood test. Contrast-enhanced computed tomography revealed the SMT with a cystic degenerative lesion …
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