Morphologic Evaluation of Ductus Diverticulum Using Multi-Detector Computed Tomography: Comparison with Traumatic Pseudoaneurysm of the Aortic Isthmus
- Authors
- Ann, Jun Hyung; Kim, Eun Young; Jeong, Yu Mi; Kim, Jeong Ho; Kim, Hyung Sik; Choi, Hye-Young
- Issue Date
- Oct-2016
- Publisher
- KOWSAR PUBL
- Keywords
- Ductus Diverticulum; Aorta; Thoracic; Tomography; X-ray Computed; Trauma
- Citation
- IRANIAN JOURNAL OF RADIOLOGY, v.13, no.4
- Journal Title
- IRANIAN JOURNAL OF RADIOLOGY
- Volume
- 13
- Number
- 4
- URI
- https://scholarworks.bwise.kr/gachon/handle/2020.sw.gachon/7866
- DOI
- 10.5812/iranjradiol.38016
- ISSN
- 1735-1065
- Abstract
- Objectives: To evaluate morphologic variations at the aortic isthmus with particular attention to ductus diverticulum, a mimicker of traumatic pseudoaneurysm, and to describe differences using Computed Tomography (CT) images. Patients and Methods: From December 2013 to December 2014, patients who underwent a chest CT examination after blunt trauma at our emergency department were included. Aortic isthmus morphologies were evaluated using multiplanar reconstruction (MPR) and maximum intensity projection (MIP) images as follows. Type I -concave contour, type II -convexity without a discrete bulge, or type III -a discrete focal bulge (defined as ductus diverticulum). Results: After excluding 11 cases of traumatic pseudoaneurysm of the aortic isthmus, a total of 432 trauma patients (mean age = 47.1 +/- 19.1 years, number of males = 318) were evaluated for aortic isthmus morphology, and classified as follows; type I (n = 240, 55.6%), type II (n = 157, 36.3%), and type III (n = 35, 8.1%). As compared with traumatic pseudoaneurysm (n = 11), ductus diverticulum had a smaller vertical diameter (5.5 +/- 1.3mmvs. 11.2 +/- 2.7 mm, P < 0.001), a broader base (14.9 +/- 4.1mmvs. 8.8 +/- 4.5 mm, P < 0.001), a smoother margin (97.1% vs. 27.3%, P < 0.001), and formed obtuse angle with the aortic wall. Furthermore, ductus diverticulum was not associated with the presence of a dissection flap or hemomediastinum. Conclusion: Ductus diverticulum, a mimicker of traumatic pseudoaneurysm of the aortic isthmus, is a frequently observed anatomic variant during CT examinations. Familiarity with its CT imaging findings could avoid it being confused with traumatic pseudoaneurysm in blunt trauma patients.
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