title: Monocytoid B-cell lymphoma.
abstract: A case of malignant lymphoma probably representing the neoplastic counterpart of "monocytoid B cells" is described. The lymphoma cells had medium-sized, oval to indented nuclei and moderate amounts of pale cytoplasm. Immunohistochemical studies on cryostat sections revealed positive staining for pan-B, B1, B4, BA2, 12 (HLA-DR), and IgM lambda, but not T-cell or monocytic markers.
mesh_terms: D000944:Antigens, Differentiation, B-Lymphocyte / Q000032:analysis; D001402:B-Lymphocytes; D005260:Female; D006680:HLA Antigens / Q000032:analysis; D006801:Humans; D008198:Lymph Nodes / Q000473:pathology; D008223:Lymphoma / Q000473:pathology*; D008875:Middle Aged
chemical_list: D000944:Antigens, Differentiation, B-Lymphocyte; D006680:HLA Antigens