title: Cutaneous manifestations of postthymic T cell malignancies: description of five clinicopathologic subtypes.
abstract: This study was undertaken to identify the cutaneous manifestations among different prognostic subgroups of postthymic T cell malignancies. Cutaneous involvement was demonstrated in 43 of 88 cases. We recognized five clinicopathologic subtypes: type I, classical cutaneous T cell lymphoma (CTCL) or mycosis fungoides, six cases; type II, primary large cell type CTCL, Ki-1 antigen (Ki-1+ or Ki-1-), seven cases; type III, primary angioinvasive T cell lymphoma, three cases; type IV, human T-lymphotropic virus type I (HTLV-I+) adult T cell leukemia/lymphoma (ATL), eight cases; type V, secondary cutaneous involvement by peripheral T cell lymphoma (PTL), 19 cases. Primary CTCL and ATL tend to involve papillary dermis with or without epidermotropism, whereas PTL and angioinvasive T cell lymphoma predominantly affect skin adnexae, vessels, and subcutis. Cutaneous lesions in type V PTL are heterogeneous and may be confused with panniculitis, vasculitis, or an eczematous eruption. Classic CTCL, Ki-1+ lymphoma, and angioinvasive T cell lymphoma have a chronic course, whereas ATL, Ki-1- large cell lymphoma, and PTL are clinically aggressive.
authors.affiliation: Department of Pathology, National Taiwan University Hospital, Taipei.
authors.forename: I J
authors.initials: IJ
authors.lastname: Su
authors.forename: Y C
authors.initials: YC
authors.lastname: Wu
authors.forename: Y C
authors.initials: YC
authors.lastname: Chen
authors.forename: H C
authors.initials: HC
authors.lastname: Hsieh
authors.forename: A L
authors.initials: AL
authors.lastname: Cheng
authors.forename: C H
authors.initials: CH
authors.lastname: Wang
authors.forename: M E
authors.initials: ME
authors.lastname: Kadin
mesh_terms: D005260:Female; D006801:Humans; D016130:Immunophenotyping; D016410:Lymphoma, T-Cell, Cutaneous / Q000145:classification* / Q000401:mortality / Q000473:pathology; D008297:Male; D008875:Middle Aged; D009367:Neoplasm Staging; D011379:Prognosis; D011446:Prospective Studies; D012878:Skin Neoplasms / Q000145:classification* / Q000401:mortality / Q000473:pathology; D015996:Survival Rate