Image-proven thromboembolism in patients with severe COVID-19 in a tertiary critical care unit in the United Kingdom

•Venous thrombosis is common in patients with severe COVID-19 pneumonia.•Many of these thromboses may be immunothromboses due to local inflammation, rather than thromboembolic disease.•Anticoagulated patients with COVID-19 pneumonia have a risk of major bleeding. The novel coronavirus 2 (SARS-CoV-2) was first described in Wuhan, China, in December 2019, and causes the infectious disease; COVID-19, which has been declared a pandemic by the World...