Gissila AzmeraAlwan AmirMelkamu Teworos2021-04-082023-11-052021-04-082023-11-052020-10http://etd.aau.edu.et/handle/123456789/26000Objective: This study is designed to assess the magnitude of common incidental variants andanomalies of the systemic mediastinal vasculatures Method: The study was conducted at TASH from September 2019- Nov2019. A hospital-basedretrospective cross-sectional study wasconducted at TASH to address the specific objectiveduring the study period. The study was conducted among patients being evaluated at TikurAnbessa Specialized Hospital who had post-contrast chest CT during the study period. Thesource population were all adult patients with post-contrast chest CT during the data collectionperiod. Data was collected by evaluating chest CT scans from PACS. The data was checked for clarityand completeness. Computerized data analysis was conducted by using SPSS version 25.0 software Result: A total of 422 (N = 422) patients were included in the study out of which aortic branching anatomy was evaluated in 384 patients out of which 220 (57.3%) had normal classic anatomy and164(42.7%) cases had variant anatomy with a common origin of brachiocephalic trunk and leftcommon carotid artery contributing to the majority of these variants (37.3%) and left vertebralartery arising from the aortic arch making up 3.1%. An aberrant right subclavian artery was seenin 2%. There was one case of a right vertebral artery arising directly from the aortic archconstituting 0.3% of the sample. A total of 384(N=384) patients were evaluated for right-sided aortic arch and there were no cases found suggesting a prevalence <0.3%. A total of 384 (N=384)patients were evaluated the for Azygos lobe out of which 3 (0.8%) had Azygos lobe. A totalnumber of 384 (N=384) cases were evaluated for left-sided superior vena cava and there were nocases found suggesting a prevalence <0.3%. Conclusion: Variants of systemic mediastinal vasculature are common .An understanding andanticipation of these entities on post-contrast chest CT enables precise reporting and is essential inpre-procedure planning.en-USMediastinal vascular anomaliesThesis