Most extramedullary plasmacytomas are associated with the upper respiratory
tract. Primary pulmonary plasmacytomas are rare, and the treatment is surg
ical excision. This malignancy advances to multiple myeloma in a minority o
f patients. The patient in our case report is the first to experience renal
failure due to hematologic monoclonal gammopathy. Postoperatively, serum p
rotein electrophoresis reverted to normal.