title: A CD5+ leukemic lymphoma with monocytoid features: an unusual B-cell lymphoma mimicking hairy-cell leukemia.
abstract: A case of lymphoma presenting with features shared by hairy cell leukemia (HCL) and its variant, intermediate lymphocytic lymphoma (ILL) and monocytoid B-cell lymphoma (MBCL) is described. Clinical presentation and the morphological findings observed in peripheral blood and in bone marrow biopsy suggested an HCL; however, the tartrate-resistant acid phosphatase negativity of peripheral blood lymphocytes, the histologic pattern observed in the spleen, and the immunophenotyping of peripheral blood, spleen and bone marrow neoplastic lymphocytes (expression of CD5 and lack of CD25), were strongly against this hypothesis. The clinical course was aggressive. This report emphasizes the concept of the equivocal presentation of some 'low-grade' B-cell lymphomas. It is further pointed out that, even with complete and exhaustive morphological and immunological analyses, atypical cases may be encountered.
authors.affiliation: Padua University School of Medicine, Department of Clinical Medicine, Italy.
authors.forename: F
authors.initials: F
authors.lastname: Adami
authors.forename: M
authors.initials: M
authors.lastname: Chilosi
authors.forename: M
authors.initials: M
authors.lastname: Lestani
authors.forename: A
authors.initials: A
authors.lastname: Scarpa
authors.forename: R
authors.initials: R
authors.lastname: Zambello
authors.forename: F
authors.initials: F
authors.lastname: Pomponi
authors.forename: G
authors.initials: G
authors.lastname: Semenzato
authors.forename: F
authors.initials: F
authors.lastname: Menestrina
mesh_terms: D000368:Aged; D015703:Antigens, CD / Q000032:analysis*; D001706:Biopsy; D001853:Bone Marrow / Q000473:pathology; D018956:CD5 Antigens; D003937:Diagnosis, Differential; D005803:Genes, Immunoglobulin; D006801:Humans; D007150:Immunohistochemistry; D016130:Immunophenotyping; D015448:Leukemia, B-Cell / Q000175:diagnosis / Q000235:genetics / Q000473:pathology; D007943:Leukemia, Hairy Cell / Q000175:diagnosis*; D008198:Lymph Nodes / Q000473:pathology; D016393:Lymphoma, B-Cell / Q000175:diagnosis* / Q000235:genetics / Q000473:pathology; D008297:Male; D011948:Receptors, Antigen, T-Cell / Q000235:genetics; D015375:Receptors, Interleukin-2 / Q000032:analysis
chemical_list: D015703:Antigens, CD; D018956:CD5 Antigens; D011948:Receptors, Antigen, T-Cell; D015375:Receptors, Interleukin-2