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We encountered a 65-year-old man with gamma heavy chain disease associated with extramedullary plasmacytoma of the thyroid gland. Serum electrophoresis revealed an abnormal fast gamma band that cross-reacted with anti-IgG (Fc gamma) sera immunoelectrophoretically. Intracytoplasmic monoclonal immunoglobulin, IgG (Fc gamma), was demonstrated in thyroid tissue sections using an indirect immunofluorescence method. After surgery, the serum abnormal fast gamma band disappeared. At the time of writing, the patient has survived 18 months post-surgery.

Extramedullary plasmacytoma of the thyroid gland producing gamma heavy chain.