title: Skeletal manifestations in cutaneous T-cell lymphomas.
abstract: The clinical course of three patients with cutaneous T-cell lymphoma (CTCL) in whom skeletal disease developed is presented and the literature on skeletal involvement in these disorders is reviewed. Three separate types of skeletal manifestations occurred: (1) osteolytic lesions, (2) osteoblastic lesions, and (3) diffuse osteoporosis. Hypercalcemia was present in two cases. Tumor cells from two patients in short-term culture secreted osteoclast-activating factor(s). Both of these patients had pathologic evidence of osteoclast activation in bone sections. Thus, the tumor cells in certain patients with CTCL may derive from a monoclonal proliferation of a T-cell subset capable of producing humoral bone-resorbing factor(s) similar to those demonstrated in cultures of mitogen- and antigen-activated normal lymphocytes. Since skeletal lesions are unusual, it would follow that other T-cell subsets account for pathologic cell proliferation in most patients with CTCL.
mesh_terms: D000328:Adult; D001862:Bone Resorption / Q000209:etiology* / Q000503:physiopathology; D005260:Female; D006801:Humans; D006934:Hypercalcemia / Q000209:etiology; D008297:Male; D008875:Middle Aged; D009182:Mycosis Fungoides / Q000150:complications*; D010024:Osteoporosis / Q000209:etiology*; D010026:Osteosclerosis / Q000209:etiology; D012751:Sezary Syndrome / Q000150:complications*; D012878:Skin Neoplasms / Q000150:complications*; D013601:T-Lymphocytes / Q000648:ultrastructure