Inclusion Criteria:  Age > 18 years old; molecular diagnosis of SARS-CoV-2 (Severe Acute Respiratory Syndrome Coronavirus 2) infection through nose-pharyngeal swab or bronchoalveolar lavage via real-time PCR analysis; hospital admission because of clinical/radiological diagnosis of pneumonia; onset of thoracic complications during hospitalization or prolonged hospitalization requiring thoracic surgical procedures; hospital admission from 01/03/2020 to 31/05/2021.  Exclusion Criteria:  -