Inclusion Criteria:  Patients who undergo bronchoscopy with image and/or videos recording of NBI aspect of the proximal bronchial tree (carina, right and left upper lobe). Patients hospitalized with SARS-CoV2 infection proven by RT-PCR test patients hospitalized with lower respiratory tract infections unrelated to SARS-CoV2 (RT-PCR negative for SARS-CoV2) Patients who have had bronchoscopy performed as part of the assessment of a distal pulmonary nodule (RT-PCR negative for SARS-CoV2).  Exclusion Criteria:  Patients under legal protection Patients who refuses the use of his personal medical data