Localized duodenal neoplasms are relatively rare entities, most often representing invasions of the duodenum by malignant masses developed in the duodeno-pancreatic region. The paper makes a more exact analysis of radiological semiology of duodenal localized tumors and seeks to determine through this analysis the role of radiological examinations in the support for the anatomopathologist. The study group included 17 cases of duodenal localized tumors, nine cases of which have been shown to be vaterian ampulloma and eight malignant tumors of the duodenum. All cases were CT (computed tomography) examined and two-thirds were performed conventional radiological examinations, prior to CT examination. Pre-operatively, all cases were evaluated endoscopically, and in three of them bile prostheses were made. CT examination protocol included a native acquisition and post-administration of intravenous contrast agent in both the arterial phase and in parenchymal and venous phase. The acquisition was made with 3 mm thin sections, subsequently coronal and sagittal plane reconstructions being made. The paper tries to establish possible correlations between the morphopathological aspect and the radio-imaging semiological characteristics of lesions.