[Cutaneous Waldenström's macroglobulinemia].

BACKGROUND: We report the case of a patient in whom the first manifestation of Waldenström' s macroglobulinemia was specific skin lesions, treated with chlorambucil chemotherapy. CASE REPORT: A 76-years old woman was referred to us because of chronic red nodular lesions on her face. A biopsy specimen showed a dense lymphocytic dermal infiltrate and immunohistochemistry identified a monoclonal B lymphoid population with an IgM-kappa phenotype. The patient's disease was diagnosed as Waldenström's macroglobulinemia with cutaneous localization, on the basis of a high level of circulating macroglobulinemia and a lymphoplasmocytic infiltrate in the bone marrow expressing the same monoclonal IgM-kappa as in blood and skin. Treatment with radiotherapy (12 Grays) was unsuccessful. Chlorambucil (16 mg per day, 7 days per month) was then introduced with rapid disappearance of the skin lesions. Neutropenia led to withdrawal of this treatment after 4 courses. The skin lesions relapsed 18 months later and were cured with chlorambucil at a lower dose. DISCUSSION: Specific skin infiltrates have been rarely described during Waldenström's macroglobulinemia. Review of the literature showed eight cases of such lesions treated by chemotherapy with only two successes with oral cyclophosphamide and polychemotherapy (cyclophosphamide, vincristine and CCNU). Chlorambucil was used unsuccessfully three times. We hypothesize that primary resistance to alkylating-agent and the small number of cases of cutaneous Waldenström's macroglobulinemia may explain the poor response to systemic chemotherapy previously reported.