A Rare Collision Tumor Composed of Follicular Lymphoma and Adenocarcinoma in the Ampulla of Vater: A Case Report
Figure 6
Immunohistochemical findings of follicular lymphoma. ((a)–(f)) Atypical lymphoid cells are positive for CD10 (a) and CD20 (b). BCL2 protein is intensively expressed in the centers of the follicles (c). Atypical lymphocytes in small nodular lesions (Figure 5(c)) around the mass of the ampulla of Vater are immunohistochemically positive for CD10 (d) and BCL2 (e). In regional lymph nodes (Figure 5(d)) in the duodenum, BCL2 protein is intensively expressed in the centers of the follicles (f).
