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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 …
Contributors DM wrote the manuscript and analysed the patient’s data. HH collected the patient’s data. YA gave final approval of the manuscript.
Competing interests None declared.
Patient consent for publication Obtained.
Ethics approval This study was reviewed and approved by the New Tokyo Hospital Institutional Review Committee.
Provenance and peer review Not commissioned; externally peer reviewed.
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