Fig. 6

Microscopic findings of the needle biopsy specimens. The central part (a H.E. staining, b CK7 staining, × 40) and the peripheral part (c H.E. staining, d CD20 staining, × 40). The central part was diagnosed as an adenocarcinoma positive for CK7 and the peripheral part was diagnosed as a low-grade B cell lymphoma positive for CD20, characterized by diffuse proliferation of small lymphoid cells