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

Highlights • 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.