Cross Sectional Study Of Systemic Mediastinal Vascular Anomalies And Variations In Patients Evaluated At Tikur Anbessa Specialized Hospital Addis Ababa University Addis Ababa Ethiopia From September 2019-november2019.

Objective: This study is designed to assess the magnitude of common incidental variants andrnanomalies of the systemic mediastinal vasculatures rnMethod: The study was conducted at TASH from September 2019- Nov2019. A hospital-basedrnretrospective cross-sectional study was conducted at TASH to address the specific objectivernduring the study period. The study was conducted among patients being evaluated at TikurrnAnbessa Specialized Hospital who had post-contrast chest CT during the study period. Thernsource population were all adult patients with post-contrast chest CT during the data collectionrnperiod. rnData was collected by evaluating chest CT scans from PACS. The data was checked for clarityrnand completeness. Computerized data analysis was conducted by using SPSS version 25.0rnsoftware rnResult: A total of 422 (N = 422) patients were included in the study out of which aortic branchingrnanatomy was evaluated in 384 patients out of which 220 (57.3%) had normal classic anatomy andrn164(42.7%) cases had variant anatomy with a common origin of brachiocephalic trunk and leftrncommon carotid artery contributing to the majority of these variants (37.3%) and left vertebralrnartery arising from the aortic arch making up 3.1%. An aberrant right subclavian artery was seenrnin 2%. There was one case of a right vertebral artery arising directly from the aortic archrnconstituting 0.3% of the sample. A total of 384(N=384) patients were evaluated for right-sidedrnaortic arch and there were no cases found suggesting a prevalence

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