Extramedullary plasmacytoma of the lung.

Three patients with extramedullary plasmacytoma of the lung are described, one of whom also had cervical lymph node metastasis, with the production of an M-protein. The production of M-protein normalized after successful treatment of the localized disease. In all three patients, the disease was locally controlled with radiation therapy, but it became generalized from 6 months to less than 3 years of the initial presentation.