title: T-cell prolymphocytic leukemia involving extramedullary sites.
abstract: T-cell prolymphocytic leukemia (T-PLL) can involve extramedullary sites, but the diagnosis is usually established by examination of blood and bone marrow. As a result, the histologic findings at extramedullary sites are poorly documented in the literature. We describe 19 extramedullary biopsy specimens from 14 patients with T-PLL. Skin (n = 10) was the most common site biopsied. T-PLL surrounded dermal blood vessels and appendages (n = 6), diffusely replaced dermis (n = 3), or formed a subcutaneous mass (n = 1). Other extramedullary sites included liver and lymph nodes (3 each) and spleen, lung, and cecum (1 each). In liver and lymph nodes, the neoplasm predominantly involved portal tracts and paracortex, respectively. Cytologically, the T-PLL cells were round (n = 16) or Sezary cell-like (n = 3). Nucleoli were observed in a subset of cells in 8 specimens and were prominent in 3 specimens. Immunostaining for T-cell leukemia-1 (TCL-1) was positive in specimens from 9 (64%) of 14 patients. We conclude that the prolymphocytoid features of T-PLL cells can be difficult to detect in routinely stained sections of extramedullary biopsy specimens. TCL-1 expression can aid in diagnosis at extramedullary sites.
authors.affiliation: Department of Hematopathology, The University of Texas M.D. Anderson Cancer Center, Houston 77030, USA.
authors.forename: Jose R
authors.initials: JR
authors.lastname: Valbuena
authors.forename: Marco
authors.initials: M
authors.lastname: Herling
authors.forename: Joan H
authors.initials: JH
authors.lastname: Admirand
authors.forename: Anthony
authors.initials: A
authors.lastname: Padula
authors.forename: Dan
authors.initials: D
authors.lastname: Jones
authors.forename: L Jeffrey
authors.initials: LJ
authors.lastname: Medeiros
mesh_terms: D000368:Aged; D014408:Biomarkers, Tumor / Q000378:metabolism; D005260:Female; D006801:Humans; D007150:Immunohistochemistry; D016130:Immunophenotyping; D015463:Leukemia, Prolymphocytic / Q000378:metabolism / Q000401:mortality / Q000473:pathology*; D015458:Leukemia, T-Cell / Q000378:metabolism / Q000401:mortality / Q000473:pathology*; D008221:Lymphoid Tissue / Q000378:metabolism / Q000473:pathology*; D008297:Male; D008875:Middle Aged; D012751:Sezary Syndrome / Q000378:metabolism / Q000401:mortality / Q000473:pathology; D012878:Skin Neoplasms / Q000378:metabolism / Q000401:mortality / Q000473:pathology*; D015996:Survival Rate; D013781:Texas / Q000453:epidemiology
chemical_list: D014408:Biomarkers, Tumor