Benign lymphoid disorders of the lung, with a theory regarding their development.

The authors review the clinical, radiographic, and pathologic features of the benign pulmonary lymphoid disorders. The essential role of immunopathologic techniques in distinguishing pulmonary lymphoid hyperplasias from malignant lymphoma is stressed. A theory regarding the development of pulmonary lymphoid hyperplasia is proposed as a basis for understanding these disorders. The authors suggest that lymphoid hyperplasia is a basic inflammatory response of the lung.