Bronchogenic cyst is relatively uncommon disease in clinical practice. 15 cases of Bronchogenic cyst were obtained and X-ray findings were analized retrospectively. The results are as follows : 1. 5 patients were symptom free(30%) and common symptoms and signs were hemopgysis, dyspnea, chest pain in order of frequency. 2. 9 patients were frmale and 6 patients were male. The most common age goup was 21 years old to 30 years old (40%) and the nex common age group was 31 years old to 40 years old(20%). 3. 9 cases of intrapulmonary bronchogenic cyst and 6 cases of mediastinal bronchogenic cyst were obtained. 4. The average size of bronchogenic cyst was about 8 $ imes$7$ imes$6 cm. 5. The common location of intrapulmonary bronchogenic cyst was lower lobe(56%) and common X-ray findings was thin walled cystwith air fluid level(78%). 6. Bronchography was performed in 3 cases of intrapulmonary bronchogenic cyst and only one case demonstrated communication with bronchus. 7. All 6 cases of medias inal bronchogenic cyst showed well marginated soft tissue mass density. 3 cases were performedn C-T scanning and average precontrast Hounsfield number was 51 unit. No case showed contrast enhancement.