A 64-year-old man presented with a rapidly growing cutaneous mass on the right leg. He was diagnosed plasma cell myeloma six years ago with multiple osteolytic bone lesions in the frontal parietal bones, right distal ulnar, left femur, and L4 vertebral body. Immunoglobulin studies confirmed the diagnosis of lambda light chain disease. He subsequently developed a metastatic lesion in the nasopharynx. The histologic features of the skin biopsy are illustrated in Figs. 37.1 and 37.2.


Distal Ulnar Lambda Light Chain Plasma Cell Myeloma Extramedullary Plasmacytoma Solitary Plasmacytoma 
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