Purpose : To evaluate CT findings of primary adenocarcinoma of the lung and to assess distant metastasis atthe time of diagnosis. Materials & Methods : CT findings of 150 patients with adenocarcinoma, confirmed byhistopathologic methods, were classified as central or peripheral lesions and pattern analysis of typical findingsnoted in this cancer was carried out. Intra and extrathoracic metastases of adenocarcinoma were also investigated.Results : Of 150cases of adenocarcinoma of the lung, 121 were found to be of the peripheral type and 29 were ofthe central type. These peripheral lesions comprised 105 nodules, 11 consolidations, four cavities and one linearlesion, while the central lesions consisted of 19 cases of atelectasis and tens of bronchial wall thickening. Lungto lung(nine cases), lymphangitic(five cases), and pleural metastasis(16 cases) were presented as intrathoracicmetastasis, while bone(17), brain(six), liver(two) and adrenal metastasis(one case) were presented asextrathoracic metastasis. Conclusion : The most common radiologic finding of adenocarcinoma is a peripheral singlemass or nodule but consolidation, cavity or tubular lesions, as well as atelectasis or bronchial wall thickeningalone can be presented as unusual findings of adenocarcinoma. As a consequence, it is in many cases difficult todifferentially diagnose. Distant metastasis was also noted in many cases of early T-stage lesion, so tosuccessfully manage the patient, careful evaluation of the metastasis is essential.