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.
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Date
2020-10
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Addis Abeba University
Abstract
Objective: This study is designed to assess the magnitude of common incidental variants and
anomalies of the systemic mediastinal vasculatures
Method: The study was conducted at TASH from September 2019- Nov2019. A hospital-based
retrospective cross-sectional study was conducted at TASH to address the specific objective
during the study period. The study was conducted among patients being evaluated at Tikur
Anbessa Specialized Hospital who had post-contrast chest CT during the study period. The
source population were all adult patients with post-contrast chest CT during the data collection
period.
Data was collected by evaluating chest CT scans from PACS. The data was checked for clarity
and 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 and
164(42.7%) cases had variant anatomy with a common origin of brachiocephalic trunk and left
common carotid artery contributing to the majority of these variants (37.3%) and left vertebral
artery arising from the aortic arch making up 3.1%. An aberrant right subclavian artery was seen
in 2%. There was one case of a right vertebral artery arising directly from the aortic arch
constituting 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 total
number of 384 (N=384) cases were evaluated for left-sided superior vena cava and there were no
cases found suggesting a prevalence <0.3%.
Conclusion: Variants of systemic mediastinal vasculature are common .An understanding and
anticipation of these entities on post-contrast chest CT enables precise reporting and is essential in
pre-procedure planning.
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Keywords
Mediastinal vascular anomalies