CD20/CD10 double immunostaining in the 3 histologic patterns of AITL.

Panels A and B show case 2 with histologic pattern I, panels C and D show case 10 with histologic pattern II, and panels E and F show case 28 with histologic pattern III. (A-F) Double immunostaining for CD20 in brown (DAB) and CD10 in blue (fast blue). Numerous single blue cells expressing CD10 but not CD20 are seen around the follicles and in the paracortical areas. Panels B, D, and F show high-power view of double immunostaining for CD20 and CD10. Original magnification A, C, E, × 40; B, D, F, × 400.