We performed clinical analysis about 20 cases of pulmonary parenchymal and intrabronchial hamartoma in Korea by literatures of the Korean Journal of Thoracic and Cardiovascular Surgical Society during 8 years from September 1976 to September 1984 and in addition to our hospital experienced 4 cases of pulmonary parenchymal hamartoma during same periods. 1] There were no cases below second decades. 2] Patients of pulmonary parenchymal hamartoma were asymptomatic, but patients of intrabronchial hamartoma were symptomatic [dyspnea & frequent upper respiratory tract infections]. 3] Pulmonary parenchymal hamartoma were confirmed by removal of mass, but intrabronchial hamartoma were confirmed by bronchoscopic biopsy. 4] There were no malignant changes in both type of pulmonary hamartoma.