[Solitary plasmacytoma of the lung]

A case of solitary plasmacytoma of the lung in a 64 year old woman is reported. The anatomical and clinical features of this exceedingly rare form are discussed. Stress is laid on the 'fact that diagnostic certainty can only be obtained by immunohistochemistry. It is also necessary that patients be subjected to periodical radiological and immunological studies in the postoperative period to detect the possible occurrence of multiple myeloma.