Impact of Capillaroscopy in the Investigation of Diffuse Interstitial Pneumonias

Inclusion Criteria: * Male or female over 18 years of age; * Have received a new diagnosis of PID within the last six months, confirmed by a pulmonologist; * Have undergone some specific tests within the last six months (Chest CT scan, respiratory function tests (plethysmography and CO transfer capacity measurement, immunological assessment including: screening for FAN, FR, and anti-CCP); * French-speaking patient with no comprehension difficulties; * Person affiliated with or beneficiary of a social security system; * Free, informed, and written consent signed by the participant and the investigator (no later than the day of inclusion and before any examination required by the research). Exclusion Criteria: * Have previously undergone a capillaroscopy, regardless of the reason; * Have a diagnosis or high suspicion of connective tissue disease based on initial clinical and paraclinical evaluation; * Have already started one of the following treatments for pulmonary involvement: systemic corticosteroids, immunosuppressive therapy, antifibrotic therapy; * Pregnant or breastfeeding women; * Patients covered by Articles L 1121-5 to L 1121-8 (persons deprived of their liberty by judicial or administrative decision, minors, adults subject to legal protection measures, or persons unable to give their consent).