title: Primary cutaneous extramedullary plasmacytoma secreting lambda IgG.
abstract: An adult male was described, who developed a tumour on his left arm, which was diagnosed as a primary cutaneous extramedullary plasmacytoma after histopathological, electron microscopic and immunocytochemical studies. Further studies ruled out the presence of multiple myeloma, extramedullary plasmacytoma of another site, or paraproteinaemia/paraproteinuria. During a relapse of the tumour 2 1/2 years after initial treatment, a new immunocytochemical study demonstrated that the tumour cells expressed monoclonal lambda IgG at the intracytoplasmic level, an unusual finding.
authors.affiliation: Department of Dermatology, 12 Octubre University Hospital, Madrid, Spain.
authors.forename: R
authors.initials: R
authors.lastname: Llamas-Martin
authors.forename: C
authors.initials: C
authors.lastname: Postigo-Llorente
authors.forename: F
authors.initials: F
authors.lastname: Vanaclocha-Sebastian
authors.forename: R
authors.initials: R
authors.lastname: Gil-Martin
authors.forename: L
authors.initials: L
authors.lastname: Iglesias-Diez
mesh_terms: D006801:Humans; D007074:Immunoglobulin G / Q000378:metabolism*; D008297:Male; D008875:Middle Aged; D010954:Plasmacytoma / Q000276:immunology / Q000378:metabolism*; D012878:Skin Neoplasms / Q000276:immunology / Q000378:metabolism*
chemical_list: D007074:Immunoglobulin G