title: CD34-reactive myxoid dermal dendrocytoma.
abstract: Normal skin is composed in part of cells that express CD34. These include periadnexal spindle cells, vascular endothelial cells, and interstitial dendritic cells. We report on a tumor composed mainly of CD34-reactive spindle cells. A 66-year-old Japanese woman presented with a skin-colored, dome-shaped, cutaneous papule on her left palm that was 7 mm in diameter and had developed within the preceding 3 months. Light microscopic examination showed a well-circumscribed polypoid tumor consisting of spindle-shaped cells and thin collagen fibers arranged loosely in a fascicular pattern within a myxoid matrix. Immunohistochemically, most of the tumor cells stained strongly for CD34, but did not stain with antibodies to S-100 protein, smooth muscle actin, desmin, neuron-specific enolase, epithelial membrane antigen, or factor XIIIa. Staining for vimentin and CD68 was positive. We believe this lesion to be a CD34-reactive myxoid dermal dendrocytoma of a type that has not been described previously.
authors.affiliation: Department of Dermatology, Toyonaka Municipal Hospital, Osaka, Japan. chika42@pc4.so-net.ne.jp
authors.forename: Chika
authors.initials: C
authors.lastname: Ohata
authors.forename: Kunimitsu
authors.initials: K
authors.lastname: Kawahara
mesh_terms: D000368:Aged; D015703:Antigens, CD / Q000032:analysis; D018952:Antigens, CD34 / Q000032:analysis*; D015214:Antigens, Differentiation, Myelomonocytic / Q000032:analysis; D014408:Biomarkers, Tumor / Q000032:analysis; D003713:Dendritic Cells / Q000737:chemistry / Q000473:pathology*; D005260:Female; D018219:Histiocytoma, Benign Fibrous / Q000737:chemistry / Q000473:pathology* / Q000601:surgery; D006801:Humans; D007150:Immunohistochemistry; D012878:Skin Neoplasms / Q000737:chemistry / Q000473:pathology* / Q000601:surgery; D014746:Vimentin / Q000032:analysis; D000097382:CD68 Molecule
chemical_list: D015703:Antigens, CD; D018952:Antigens, CD34; D015214:Antigens, Differentiation, Myelomonocytic; D014408:Biomarkers, Tumor; D014746:Vimentin; C067980:CD68 antigen, human; D000097382:CD68 Molecule