Figure 2: Adenocarcinoma: (A) neoplastic glands proliferation surrounded by desmoplastic stroma (hematoxylin-eosin); (B) nuclear positive immunoreactivity for TTF-1. Lymphomatous proliferation: (C) diffuse growth pattern of small sized elements (in the lower right-hand corner) interspersed with large prolymphocites and paraimmunoblasts in the upper left; (D): diffuse CD 20 positivity.