Fig. 2

Imaging findings. a An EGD showed a large circumferential ulceration on the greater curvature of the gastric body. b Biopsy specimens from the three sites (red arrows in a) were found to have microtubular glands and cribriform proliferation, suggesting the existence of a moderately differentiated tubular adenocarcinoma (tub2). These adenocarcinoma cells were surrounded by DLBCL cells. c High-power field of b. d DLBCL cells were positive for CXCR4. e Adenocarcinoma cells were positive for CXCL12/SDF-1