Inclusion criteria  Adult patient (≥18 years old) Patient admitted to Strasbourg University Hospitals for suspicion of Covid-19, between 03/01/2020 and 04/29/2020 Availability of at least one chest CT scan during hospitalization Subject not having expressed his opposition, after information, to the reuse of his data for the purposes of this research.  Non-inclusion criteria  Patient who expressed his opposition to participating in the study Patient under legal protection Patient under guardianship or guardianship