Bronchogenic cyst, pulmonary sequestration, congenital cystic adenomatoid malformation and congenital lobaremphysema are four major congenital cystic pulmonanry disease that represent a spectrum of closely relatedanomalies arising at early stage of embryonic lung bud maturation. Most of them present with recurrent pulmonaryinfections or chest pain since childhood and usually the diagnosis is made at this age. Sometimes the lesions aresilent and found at adult age. We retrospectively analyzed the plain chest radiograms of 30 patients with a lungbud anomaly. The diagnosis was established by surgery and biopsy, but bronchography, CT and ultrasonography aidedin the diagnosis, seventeen bronchogenic cysts, 8 pulmonary sequestrations, 2 congenital cystic adenomatoidmalformations, 2 congenital lobar emphusema and 1 congenital bronchial stenosis are included in this study. Nineout of 13 intarpulmonary bronchogenic cysts involved the lower lobes; thin-walled cysts with or without air-fluidlevel were the characteristic chest roentgenographic finding. However, mediastinal bronchogenic cyst showedwell-marginated mass. The pulmonary sequestration showed similar cystic mass with or without air-fluid levels infive out of eight patients, but the cyst wall was not so sharply defined as in the bronchogenic cyst. In twopatients of congenital cytic adenomatoid malformation, a large thin-walled cyst with air-fluid level was noted and differentiation form intrapulmonary bronchogenic cyst was difficult both by chest roentgenogram and CT. Two patients of congenital lobar emphysema and one patient of bronchial stenosis showed unilateral hyperlucent lungwithout discerte cystic mass formation.