Vascular modifications have been described during SARS-CoV2 infection, especially a dilatation of the bronchial arteries. Within the airway wall, small branches of the bronchial arteries cross the muscle layer to develop a submucosal network. The Narrow Band Imaging technique is used during bronchoscopy to achieve a maximum contrast of vessels and the surrounding mucosa. Therefore, it enables to observe the microvessel structure and its distribution in the bronchial mucosa. The aim of this study is to describe the vasculature pattern of the bronchial tree during infection with SARS-CoV2.

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

- Patients who undergo bronchoscopy with image and/or videos recording of NBI aspect of the proximal bronchial tree (carina, right and left upper lobe). Three groups of patients will be selected: 1) Patients hospitalized with SARS-CoV2 infection proven by RT-PCR test ; 2) patients hospitalized with lower respiratory tract infections unrelated to SARS-CoV2 (RT-PCR negative for SARS-CoV2) ; 3) Patients who have had bronchoscopy performed as part of the assessment of a distal pulmonary nodule (RT-PCR negative for SARS-CoV2).