Simultaneous occurrence of colonic adenocarcinoma and MALT lymphoma: A series of three cases

Figure 1 Histological examination of Case 1. Tubulovillous adenoma with superficial foci of high grade intraepithelial neoplasia (A: HE, × 4); coexisting colonic lymphoma of MALT type [B: HE, × 4; C: CD20, × 4; D: CD20, × 20 (lymphoepithelial lesions); E: κ light chain, × 4; F: λ light chain, × 4].

Figure 2 Histological examination of Case 2. Colonic lymphoma of MALT type adjacent to a moderately differentiated adenocarcinoma (A: HE, × 4; B: CD20, × 4; C: CKAE1/AE3, × 20). Colonic lymph node involved by lymphoma [D: HE, × 4; CD20, × 4 (inset)].

Figure 3 Histological examination of Case 3. Focus of in situ adenocarcinoma within a tubulovillous colonic adenoma (A: HE, × 4). Omentum involved by lymphoma of MALT type [B: HE, × 4; CD20, × 4 (inset)].