CTICasesAnkylosing Spondylitis
Imaging findings
Chest CT shows complete fusion of all costovertebral and costotransverse joints, along with paraspinal muscle atrophy and a rigid chest wall. The lung parenchyma itself is normal, despite severe restrictive lung function clinically.
Key takeaways
Severe ankylosing spondylitis can lead to a rigid chest wall and severe restrictive ventilatory impairment due to costovertebral joint fusion, which can clinically mimic interstitial lung disease in the absence of parenchymal fibrosis.
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