2.1 Case series and clinicopathology features
237 patients were pathologically diagnosis with cystic lesions from the pathology files in West China Hospital of Sichuan University from January 2011 to April 2019. All the original slides were reviewed and identified independently by two pathologists (P Zhou and LL Jiang). Clinical and radiographic features were obtained retrospectively from the patients’ medical records and follow-up, including age, sex, term, mechanical ventilation, clinical features, CT diagnosis, affected sites and the diameter of the cystic lesions.