Objective To analyse the CT features of solitary bronchioalveolar carcinoma(SBAC) so that to improve the CT diagnostic accuracy.Methods CT findings of 39 cases with SBAC proved by operation and pathology were studied,and an analysis as compared with 48 cases other type of peripheral pulmonary carcinoma.Results CT findings included lobulations in 32,spiculation in 33,pleural tags in 25,bronchovascular bundles in 14,vacuole or/and bronchiologram in 18 and ground glass changs in 8 cases.Conclusion The characteristic CT manifestations of SBAC are:(1)Vacuole or/and bronchiologram;(2)Long spiculation;(3)Ground-glass.It is important to recognize the CT appearances of SBAC in order to improve diagnostic ability.