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INTRODUCTION rnGastric sub-epithelial masses (SEMs) are relatively common findings when receiving gastric endoscopy.It is a mass,bulge,or impression visible.Computed tomography (CT) and magnetic resonance imaging can assist in making a diagnosis,but the final diagnosis depends on histopathological examination.Gastrointestinal stromal tumor (GIST) is a relatively frequent mesenchymal tumor of the gastrointestinal tract.