Cystic lung adenocarcinoma is a type of adenocarcinoma of the lung, which is characterized by a thin-walled cystic cavity on imaging. This type of cystic lung cancer is rare, accounting for 1%-4% of lung cancers, with a cystic cavity diameter of >5 mm, a cystic cavity thickness of <4 mm, and a cystic wall that occupies more than half of the circumference. Adenocarcinoma is more common in cystic lung cancer and squamous carcinoma is rare. The imaging features of cystic solid lung adenocarcinoma are typed as follows: type I is a nodule growing outward from the wall of the cystic cavity; type II is a nodule confined to the cavity of the cystic space; type III is a soft tissue extending along the wall of the cystic cavity; and type IV is a mixture of multiple cystic foci of solid or non-solid tissue. Surgery is the first choice for the treatment of cystic solid lung adenocarcinoma. After surgery, staging is performed according to the pathology, such as tumor size, lymph node metastasis, and the presence of distant metastasis, etc. According to the staging, further radiotherapy, chemotherapy, immunotherapy, and targeted therapy are selected.