Ankylosing spondylitis CT

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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1] ; Associate Editor(s)-in-Chief:  Manpreet Kaur, MD [2]

## Overview

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The term ankylosing is derived from the Greek word ankylos, meaning stiffening of a joint.CT allows direct visualization of the abnormalities in peripheral and axial joints. CT has resulted in a major improvement in the evaluation and management of patients with AS. Findings on CT scan suggestive of ankylosing spondylitis include erosion, osteoporosis / sclerosis, and new bone formation. However,CT has poor ability to detect soft-tissue changes and best in detecting osteoporosis or osteosclerosis.

## CT scan

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* Findings on CT scan suggestive of ankylosing spondylitis include:[1][2][3]
* Erosions
* Subchondral sclerosis
* Bony ankylosis
* Sacroiliitis
* Bamboo spine
* Ligamentous ossification and periarticular and intra-articular ankylosis
* Best in demonstrating injuries to the following:
* Cervical spine fracture especially in advanced ankylosing spondylitis patients

CT scan in ankylosing spondylitis showing Bamboo spine https://commons.wikimedia.org/wiki/File:Ankylosing_spondylitis.jpg#/media/File:Ankylosing_spondylitis.jpg

## References

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1. ↑ Ostergaard M, Lambert RG (August 2012). "Imaging in ankylosing spondylitis". Ther Adv Musculoskelet Dis. 4 (4): 301–11. doi:10.1177/1759720X11436240. PMC 3403247. PMID 22859929.
2. ↑ Lacout, Alexis; Rousselin, Benoît; Pelage, Jean-Pierre (2008). "CT and MRI of Spine and Sacroiliac Involvement in Spondyloarthropathy". American Journal of Roentgenology. 191 (4): 1016–1023. doi:10.2214/AJR.07.3446. ISSN 0361-803X.
3. ↑ Jang, Jennifer H.; Ward, Michael M.; Rucker, Adam N.; Reveille, John D.; Davis, John C.; Weisman, Michael H.; Learch, Thomas J. (2011). "Ankylosing Spondylitis: Patterns of Radiographic Involvement—A Re-examination of Accepted Principles in a Cohort of 769 Patients". Radiology. 258 (1): 192–198. doi:10.1148/radiol.10100426. ISSN 0033-8419.

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