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Plasmacytoma are extramedullary accumulations of plasma cells. Mostextramedullary plasmacytomas are associated with the upper respiratory tract. The lung is rarely involved. We report a rare case of lung plasmacytoma with multiple myeloma. The patient is a 60-year-old male who presented with chest pain and a lung mass visualized on CT scan. A preliminary diagnosis of occult lung cancer with widespread skeletal metastasis was made. The diagnosis of lung plasmacytoma with multiplemyeloma was made after extensive investigations.