Pulmonary blastoma associated with cystic lung disease.

A 2 1/2-year-old child with chronic cystic lung disease also had a large pulmonary tumor develop. A diagnosis of pulmonary blastoma, a rare primary malignant tumor of the lung, was made on pathologic examination. A review of the literature yielded reports of several patients with pulmonary blastoma who had either preexisting or concurrent cystic lung disease. Patients with chronic cystic pulmonary disease may have a predisposition for this malignant tumor.