title: CD30 positive anaplastic large-cell lymphoma mimicking Langerhans cell histiocytosis.
abstract: The presence of CD 1a+ dendritic cells (DC) has been well described in T-cell lymphoproliferative disorders, and the presence of large numbers of DCs has rarely been reported as a mimicker of Langerhans cell histiocytsis (LCH). We present the case of a 56-year-old female with a solitary nodule on the chin whose case was referred to our institution for confirmation of the diagnosis of LCH. Skin biopsy showed an ulcerated nodule containing a wedge-shaped infiltrate comprised of large atypical cells and cells with prominent grooved nuclei. The constellation of histologic and immunologic features favored a CD30 lymphoproliferative disorder of T-cell lineage even though there were accompanying numerous dendritic histiocytes and CD1a positive Langerhans cells. The sheets of CD30 positive atypical lymphoid cells which express T-cell markers were consistent with CD30 positive lymphoproliferative disease and favor CD30 positive anaplastic large-cell lymphoma (ALCL) over Langerhans histiocytosis. The absence of Anaplastic Lymphoma Kinase (ALK) staining favored a primary cutaneous origin. This case signifies a CD 30+ ALCL of the skin which histopathologically mimics a LCH. Ezra N, Van Dyke GS, Binder SW. CD30 positive anaplastic large-cell lymphoma (ALCL) mimicking Langerhans cell histiocytosis (LCH).
authors.affiliation: Department of Pathology and Laboratory Medicine, Division of Dermatopathology, David Geffen School of Medicine at UCLA, Los Angeles, CA 90095-1732, USA.
authors.forename: Navid
authors.initials: N
authors.lastname: Ezra
authors.forename: Gregory S
authors.initials: GS
authors.lastname: Van Dyke
authors.forename: Scott W
authors.initials: SW
authors.lastname: Binder
mesh_terms: D014408:Biomarkers, Tumor / Q000032:analysis; D003937:Diagnosis, Differential; D005260:Female; D006646:Histiocytosis, Langerhans-Cell / Q000378:metabolism / Q000473:pathology*; D006801:Humans; D007150:Immunohistochemistry; D017730:Ki-1 Antigen / Q000096:biosynthesis*; D017728:Lymphoma, Large-Cell, Anaplastic / Q000378:metabolism / Q000473:pathology*; D008875:Middle Aged
chemical_list: D014408:Biomarkers, Tumor; D017730:Ki-1 Antigen