Figure 2
From: Duodenal follicular lymphoma lacks AID but expresses BACH2 and has memory B-cell characteristics
CD21 and AID immunohistochemistry in duodenal, gastric, and colonic FLs. (a) CD21 immunostaining of duodenal FL. Follicular dendritic cells (FDC) present at the periphery of tumor follicles (duodenal pattern). (b) CD21 immunostaining of gastric FL. FDC networks densely present in tumor follicles (nodal pattern). (c) CD21 immunostaining of colonic FL. FDC networks densely present in tumor follicles (nodal pattern). (b) Intermediate pattern of CD21 immunostaining in colonic FL. (e) AID immunostaining in duodenal FL. Tumor cells are negative. (f) AID immunostaining of gastric FL. Tumor cells are positive. (g) BACH2 immunostaining in duodenal FL. Periphery of tumor follicles and villi are positive, but center of tumor follicle is negative. (h) BACH2 immunostaining of gastric FL. Tumor follicles are positive.
