Abstract: Objective: To investigate the value of CT on diagnosing ectopic bronchogenic cyst(EBC). Materials and Methods: The CT findings of 2 cases of EBC confirmed by pathology were retrospectively analyzed. Results: Of 2 cases of EBC, 1 case was located in the stomach esophagus district, another 1 case in left retroperitoneal region. It all showed mass with clear boundary and relatively high density, no enhancement in the cystic. One of 2 cases of EBC was smooth and thick wall, enhance performance for circular reinforcement. Another one was septum and calcification. Conclusion: CT scan and enhanced scan contributed to the diagnosis and differential diagnoses, CT were conductively to judge the location and characteristics of the lesions. It could clearly show the lesion area, shape, size, density, boundary and enhancement, but it was diagnosed with bronchial cyst by pathology only.