Objective:To analyze and compare CT manifestations and clinical pathology of bronchioloalveolar carcinoma in young people,so as to improve the diagnosis of this disease. Methods:78 young patients of bronchioloalveolar carcinoma confirmed by sur-gical pathology were retrospectively analyzed. According to the pathological manifestation,the patients were divided into 3 groups as follows: isolated-nodule group (28 cases),multiple-nodules group (24 cases),and lobar-consolidation group (26 cases). The imag-ing features of lung cancer in different groups were compared and studied. Results:In isolated-nodule group,specific signs such as lobulation,air bronchogram,and pleural indentation were showed relatively more than those in the other two groups. Multiple-nodules group showed diffuse multiple nodules in both lungs,broken stone road signs,and were often accompanied by pleural traction. Lobar-consolidation group showed low density of lungs,honeycomb lung sign,angiography sign,dry branches sign and multiple acinar nod-ules. Conclusion:Understanding CT manifestations and clinical pathology of bronchioloalveolar carcinoma in young patients can help to improve preoperative diagnosis of this disease.