deep vein thrombosis AE DJ, SS, YH a venous thrombosis that is characterized by a blood clot that forms in a vein deep in the body. Blood clots occur when blood thickens and clumps together. Most deep vein blood clots occur in the lower leg or thigh. They also can occur in other parts of the body. 10051055 SIDER: C0149871 Moved from Cardiac AE to thombosis AE by LB WEB: http://www.nhlbi.nih.gov/health/health-topics/topics/dvt/ HPO: HP_0004850 DVT venous thrombosis AE