Most vascular complications are managed conservatively; however, some require blood product transfusions or surgical intervention. Hematomas and retroperitoneal bleeding usually resolve within a few weeks as the blood is absorbed into the tissue. Severe cases may require surgical evacuation. Pseudoaneurysms and arteriovenous fistulas are usually managed by ultrasound-guided compression or, rarely, surgery. Pseudoaneurysms may require thrombin injection.