Man 59yo in check-up lung x-ray detected a mass at left lung, asymptomatic, no history tuberculosis, non smocking patient. Ultrasound of the lung showed that was a cystic avascular with well bordered mass, size of 4 cm. MSCT with CE said that cystic mass bilobar looked like a bronchogenic cyst. Operation via endoscopic thoracotomy, and punction of this mass leaking out the milky fluid, but the surgery in resection this tumor report said it looked like a caseum cyst of tuberculosis.