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Imaging Features of Systemic Sclerosis-Associated Interstitial Lung Disease
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Incomplete thymic involution in systemic sclerosis and rheumatoid arthritis.

Marine Meunier1, Ramin Bazeli, Antoine Feydy

  • 1Rheumatology A Department, Cochin Hospital, AP-HP, Paris Descartes University, 27, rue du Faubourg-St-Jacques, 75014 Paris, France.

Joint Bone Spine
|March 14, 2012
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Summary

Systemic sclerosis (SSc) and rheumatoid arthritis (RA) patients show higher rates of incomplete thymus involution compared to controls. This finding suggests a link between these autoimmune diseases and thymic abnormalities.

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Area of Science:

  • Immunology
  • Radiology
  • Rheumatology

Background:

  • The thymus is vital for immune homeostasis.
  • Thymic abnormalities are linked to autoimmune diseases, but data for SSc and RA are limited.

Purpose of the Study:

  • To determine the prevalence of incomplete thymus involution in SSc and RA patients.
  • To identify factors associated with thymic abnormalities in these autoimmune diseases.

Main Methods:

  • Retrospective analysis of CT scans from 96 SSc patients, 65 RA patients, and 32 controls (all ≥40 years old).
  • Incomplete thymus involution defined as residual thymic tissue >7 mm thick on CT scans.

Main Results:

  • Incomplete thymus involution occurred in 15% of SSc and 14% of RA patients, versus 0% in controls (P<0.05).
  • In SSc, incomplete involution correlated with pulmonary restrictive syndrome.
  • In RA, it correlated with biotherapy and absence of antinuclear antibodies.

Conclusions:

  • Systemic sclerosis and rheumatoid arthritis are associated with incomplete thymus involution.
  • These findings highlight a potential role for thymic abnormalities in the pathogenesis of SSc and RA.