Venous thrombosis is thrombosis in a vein, caused by a thrombus (blood clot). The most common form of venous thrombosis is a deep vein thrombosis (DVT), when a blood clot forms in the deep veins of the leg . If the thrombus breaks off (it embolizes) and flows towards the lungs , it can become a pulmonary embolism (PE), a blood clot in the lungs. This combination is called venous thromboembolism . Various other forms of venous thrombosis also exist; some of these can also lead to pulmonary embolism.  Venous thromboembolism and superficial vein thrombosis account for about 90\% of venous thrombosis. Other rarer forms include retinal vein thrombosis, splanchnic vein thrombosis, cerebral venous sinus thrombosis, renal vein thrombosis, and ovarian vein thrombosis.
Venous thrombosis is thrombosis in a vein, caused by a thrombus (blood clot). A common form of venous thrombosis is deep vein thrombosis (DVT), when a blood clot forms in the deep veins . If the thrombus breaks off (it embolizes) and flows towards the lungs . It can become a pulmonary embolism (PE), a blood clot in the lungs. DVT and PE comprise venous thromboembolism (VTE). Various other forms of venous thrombosis also exist; some of these can also lead to pulmonary embolism. Venous thromboembolism and superficial vein thrombosis account for about 90\% of venous thrombosis. Other rarer forms include retinal vein thrombosis, splanchnic vein thrombosis, cerebral venous sinus thrombosis, renal vein thrombosis, and ovarian vein thrombosis.
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This combination is called venous thromboembolism . Various other forms of venous thrombosis also exist; some of these can also lead to pulmonary embolism.
DVT and PE comprise venous thromboembolism (VTE).
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Various other forms of venous thrombosis also exist; some of these can also lead to pulmonary embolism.