Fig. 2.

a HE-stained sections show hypercellular BM due to extensive lymphoid infiltrate, original magnification, ×40. b Lymph node biopsy showing monomorphic lymphoid proliferation with a diffuse pattern, HE staining, original magnification, ×400. c immunohistochemistry from lymph node showing cytoplasmic localization of CD20, original magnification, ×400. d immunohistochemistry from lymph node showing lymphoid cells, expressing high levels of nuclear Cyclin D1, original magnification, ×400. BM, bone marrow.