dEtection of rheumAtoid aRthritis - Interstitial Lung dIseasE by Thoracic ultRasound

"If included, an LUS will be performed by an experienced operator, blinded to the results of the chest CT and PFT.~A linear probe (4 to 12 MHz) will be used. The patient will be installed́ in a semi-seated position with the homolateral arm above the head for the anterior and axillary evaluation then, depending on his comfort, in a seated position or in right then left lateral decubitus, arms alongside the body, for the posterior evaluation. It will be practiced by experienced operators (pneumologist) and according to a validated protocol allowing the exploration of 14 intercostal spaces. LUT will be timed, recorded and anonymized.~The operator will note the 3 ultrasound signs (total number of B lines, pleural line thickening and percentage of pleural line irregularity), their location and severity.~The radiologist, on his part, will evaluate the patient's chest CT (gold standard), blinded to the results of the LUS, to make or not the diagnosis of RA-ILD."