Background: Ultrasonography can detect different changes in anterior chest wall (ACW ) joints in patients with rheu‑matoid arthritis (RA) even before being clinically manifested. Airways, pleura, lung parenchyma, and vascular compart‑ment all may be attacked by RA. This study was aiming at detecting the relation between ultrasonographic changes of asymptomatic ACW joints and pulmonary function tests (PFTs) in patients with RA.Results: US detected subclinical changes of ACW joints in (74.2%) of RA patients with significant difference between total US changes in RA (74.2%) and control (21.2%) (p < 0.001). MSJ ankylosing and erosions were highly associated with limited chest expansion in RA group (P <0.001). Restrictive PFTs were associated with SCJ synovitis (p < 0.05), SCJ PD activity (p < 0.05), SCJ erosions (0.02), and highly associated with MSJ ankylosing and erosions (p < 0.001).Conclusions: This study demonstrated that ultrasonographic subclinical changes in ACW joints are associated with restrictive pattern by spirometry and limited chest expansion in RA patients. (PDF) Relation between pulmonary function tests and ultrasonographic changes of asymptomatic anterior chest wall joints in rheumatoid arthritis patients. Available from: https://www.researchgate.net/publication/358216628_Relation_between_pulmonary_function_tests_and_ultrasonographic_changes_of_asymptomatic_anterior_chest_wall_joints_in_rheumatoid_arthritis_patients [accessed Jan 30 2022].