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Figure 1: (a) Gross view of tumour during EGD examination: polypoid tumour with intact overlying mucosa and central umbilication. (b) Gross view of tumour on EGD with NBI. (c) EUS: Iso/hypoechoic homogeneous tumour arising from the MM layer with a preserved PM layer on the posterior wall of the antrum (17.4 mm × 5.1 mm). Some hyperechoic foci (green arrow) were observed inside the tumour, and no obvious ductal structure was observed. (d) CT: Focal enhancing mucosal or submucosal thickening (red circle). (e) Gross view of the specimen. EGD: Esophagogastroduodenoscopy, NBI: Narrow-band imaging, EUS: Endoscopic ultrasonography, CT: Computed tomography, MM: muscularis mucosa, PM: muscularis proper

Figure 1: (a) Gross view of tumour during EGD examination: polypoid tumour with intact overlying mucosa and central umbilication. (b) Gross view of tumour on EGD with NBI. (c) EUS: Iso/hypoechoic homogeneous tumour arising from the MM layer with a preserved PM layer on the posterior wall of the antrum (17.4 mm × 5.1 mm). Some hyperechoic foci (green arrow) were observed inside the tumour, and no obvious ductal structure was observed. (d) CT: Focal enhancing mucosal or submucosal thickening (red circle). (e) Gross view of the specimen. EGD: Esophagogastroduodenoscopy, NBI: Narrow-band imaging, EUS: Endoscopic ultrasonography, CT: Computed tomography, MM: muscularis mucosa, PM: muscularis proper