dEtection of rheumAtoid aRthritis - Interstitial Lung dIseasE by Thoracic ultRasound

Inclusion Criteria: * Adult patient (age \> 18 years) followed at CHU of Tours * Diagnosis of rheumatoid arthritis validated according to ACR 2010 criteria, EULAR classification, regardless of time since diagnosis * Patient who has had or will have a thoracic CT scan and PFT performed as part of routine care in the 6 months preceding or following inclusion * Patient with at least two risk factors for developing RA-ILD among : * Male sex or * Active or former smoker assessed at 20 pack-year or * Age \> 60 years or * Levels of RF≥3N (rheumatoid factor) and/or anti-CCP≥3N (antibodies against cyclic citrullinated peptides) at diagnosis or at any time during the course of the disease or * High RA activity score (DAS28\>3.2) Exclusion Criteria: * Diagnosis of congenital lung disease * Diagnosis of another autoimmune pathology associated with RA (overlap syndrome) linked to the development of ILD (interstitial lung disease) (systemic sclerosis, myositis, dermatomyositis, mixed connectivitis, systemic lupus erythematosus or other ANCA vasculitis, with the exception of secondary Gougerot-Sjögren's syndromes). * Current or operated lung cancer * Thoracic irradiation * Thoracic transplant patients * Previous invasive thoracic procedures * Pathologies responsible for pleural thickening (silicosis, asbestosis, known pleural plaque, pleural sequelae of tuberculosis) * Pregnant or breast-feeding women * Patient under legal protection (guardianship, curatorship or safeguard of justice) * Patient who has objected to data processing * Parenchymal infection current or less than one month old prior to LUS examination * Liquid or gaseous pleural effusion