Multiple myeloma presenting as cervical lymphadenopathy in a 16-year-old boy.

A 16-year-old boy presented with cervical lymphadenopathy and histological features of a plasmacytoma. He was found to have lytic bone lesions, a serum IgA M-protein, and elevated beta 2-microglobulin. There was absence of anemia, hypercalcemia, and marrow plasmacytosis.