Clinical Relevance of Thoracic Echography for the Early Diagnosis of Interstitial Lung Disease in Systemic Scleroderma - Pilot Study

Inclusion Criteria: * Age ≥ 18 years old * Diagnosis of systemic scleroderma according to EULAR/ACR 2013 criteria * Absence of diffuse interstitial lung disease proven by scanner on the day of inclusion * Forced vital capacity ≥ 80% of the value predicted on the last respiratory function test performed. * Carbon monoxide diffusion capacity corrected for hemoglobinemia ≥ 70% of the value predicted on the last respiratory function test performed. * Patient capable of performing functional exploration during the year * Affiliation to a social security system * Patient who has given free and informed consent Exclusion Criteria: * Any other connectivity associated to systemic sleroderma * Any chronic pathologies, co-morbidities, history judged by the investigator as being likely to lead to complications for the patient and/or which may impact the results of functional exploration during exercise. * All known fibrotic and/or obstructive respiratory pathologies. * Presence of echocardiographic signs of pulmonary arterial hypertension according to 2015 criteria * Diagnosis of left heart disease * Cumulative smoking \> 10 packs.years * Infectious pneumonia within 90 days prior to inclusion * Acute respiratory illness requiring hospitalization within one year prior to inclusion * Pregnant or breastfeeding woman * Refusal to participate in the study * Refusal to use the data * Adults under legal protection (temporary protection measure, curatorship, guardianship)