Purpose : We studied CT findings of bronchioloalveolar carcinoma that manifestated varied clinical andradiologic characteristics. Materials & Methods : We studied presenting radiographic patterns and theircharacteristics and secondary findings of histologically proven 30 cases of bronchioloalveolar carcinomas on chestCT scan. Results : Bronchioloalveolar carcinoma appeared radiologically as a solitary nodule(19 cases),consolidation(7 cases), and multinodules(4 cases). A solitary nodular type shows irregular or spiculated borders,peripheral or subpleural location, heterogenous density, pleural tags, pseudocavitation, and sometimesrim-enhancement of mass. A consolidation type shows air-brochogram, pseudocavitation and CT angiogram withinhomogenous low attenuated consolidated lung. Hilar and mediastinal lymphadenopathy as secondary findings ofbronchioloalveolar carcioma appeared frequently(43.3%), Even in a solitary nodular form, hilar & mediastinallymphadenopathy was noted in 36.8% and follow-up study in 6 cases showed lung-to-lung metastasis with 14.7 monthsin mean metastasis duration. Conclusion : It is difficulty in diagnosis of bronchioloalveolar carcioma withclinical or plain radiographic features alone because of theis variability. We found that CT scan can help thediagnosis of this tumor. We also found out that a solitary form of bronchioloalveolar carcioma as well as diffuseform does not have a good prognosis.