Primary malignant lymphoma of lung.

Primary malignant lymphoma of the lung is a rare variety of lymphosarcoma, to be distinguished from secondary lung involvement in disseminated malignant lymphoma. The condition tends to remain localized to the lung, and lymph nodes are not involved. The prognosis is better than in disseminated malignant lymphoma, and in the case described here a 35-year-old woman was treated by radiotherapy and chemotherapy and survived 20 years.