RESUMEN El mieloma de células plasmáticas secretor de IgD es una neoplasia de células plasmáticas poco frecuente y agresivo, generalmente afecta individuos más jóvenes que los demás mielomas. Es de difícil diagnóstico, ya que no se observa el pico de proteína monoclonal característico de los mielomas; no obstante, la inmunofijación, la cuantificación de IgD y el estudio de orina son pruebas de gran utilidad para su diagnóstico. Con respecto a las manifestaciones clínicas, es frecuente anemia, falla renal y múltiples lesiones óseas; además, la enfermedad tiene un curso agresivo, con poca respuesta a la quimioterapia convencional. A continuación, se describe un caso de una mujer de 57 años con antecedentes de dolor óseo y múltiples lesiones líticas óseas, quien fue diagnosticada con mieloma secretor de IgD a partir de la electroforesis de proteínas en suero, la inmunofijación en suero y orina, la cuantificación de IgD y el estudio medular. ABSTRACT Immunoglobulin D plasma cell myeloma is a rare and aggressive plasma cell disorder, which usually occurs in younger patients than other myelomas. Immunoglobulin D multiple myeloma is usually misdiagnosed because of the lack of a typical monoclonal protein spike; however, immunofixation electrophoresis, Immunoglobulin D serum levels and urine analysis are highly useful for diagnosis of the disease. Regarding clinical manifestations, patients commonly have anemia, renal failure, and multiple bone lesions. In addition, patients show an aggressive clinical course with poor response to conventional treatment and unfavorable prognosis. We report a 57 years-old female who presented with bone pain and multiple osteolytic bone lesions; according to serum protein electrophoresis, serum and urine immunofixation, IgD serum levels, and bone marrow biopsy, a final diagnosis of immunoglobulin D plasma cell myeloma was made. KEY WORDS Multiple myeloma, immunoglobulin D, renal insufficiency
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