A venous thrombosis or phlebothrombosis is a blood clot (thrombus) that forms within a vein. Thrombosis is a term for a blood clot occurring inside a blood vessel. A classical venous thrombosis is deep vein thrombosis (DVT), which can break off, and become a life-threatening pulmonary embolism (PE). The disease process venous thromboembolism (abbreviated as VTE or DVT/PE) can refer to DVT and/or PE.
