title: Granulomatous slack skin: a clinicopathological and immunohistochemical study of three cases.
abstract: Three cases of granulomatous slack skin (GSS), a rare variant of T-cell lymphoma, are reported. Immunohistochemical studies using a panel of 16 antibodies were carried out on both frozen tissue and tissue embedded in paraffin wax to characterize the infiltrate. A routine immunoperoxidase technique was used to identify T cells (UCHL1, CD45R0), B cells (L26, 4KB5 [CD45R]), S100 protein-positive cells, monocytes/macrophages (Mac-387, KP1 [CD68]), and dermal dendrocytes (factor XIIIa) in paraffin sections. A close association was found between UCHL1-positive T cells and KP1-positive giant cells. A number of S100-positive cells and factor XIIIa-positive cells were present in the infiltrate from all three patients. The lymphocytes in two of the patients were predominantly of the helper T-cell phenotype. Giant cells from all three patients stained with KP1 (CD68) and Leu M3 (CD14). These studies confirm that the infiltrate in GSS is predominantly a T-cell disorder associated with monocyte-derived cells rather than with resident dendritic macrophages.
authors.affiliation: Department of Dermatology, Mayo Clinic, Rochester, Minnesota.
authors.forename: K F
authors.initials: KF
authors.lastname: Helm
authors.forename: R
authors.initials: R
authors.lastname: Cerio
authors.forename: R K
authors.initials: RK
authors.lastname: Winkelmann
mesh_terms: D000328:Adult; D001365:Axilla; D015726:Giant Cells / Q000473:pathology*; D006801:Humans; D007124:Immunoenzyme Techniques; D008214:Lymphocytes / Q000473:pathology*; D016410:Lymphoma, T-Cell, Cutaneous / Q000276:immunology / Q000473:pathology*; D008297:Male; D008875:Middle Aged; D012867:Skin / Q000473:pathology*; D012878:Skin Neoplasms / Q000276:immunology / Q000473:pathology*; D006377:T-Lymphocytes, Helper-Inducer / Q000276:immunology