Eighty-seven patients were identified. The diagnoses included congenital cystic adenomatoid malformation (41%), bronchogenic cyst (19.3%), sequestration (13.2%), and congenital lobar emphysema (12.0%). Fifty patients were observed for some period. Eleven became symptomatic, and 47 underwent resection at a mean age of 11 months. There was no difference in the type of resection, length of hospitalization, or complication rate between patients who underwent early vs delayed resection