<unk>  is the formation of a<unk> us (medical term for a clot) inside a blood vessel. This can dislodge from the site it was formed and can move along the flow of blood to distant places in the body. A piece of<unk> us that is transported in this way is called an embolus (plural emboli). This process of formation an emboli, from a<unk> us is called<unk> oembolism. The term was coined in 1848 by Rudolph Carl Virchow.
The most important sites of<unk>  formation, based on their frequency and clinical effect are coronary arteries and deep veins of the legs. Former, the most important site of arterial<unk>  and latter the most important site of venous<unk> .
Thrombosis
Thrombus
Neoplasia
Adhesion 
Abscess
Bleeding 
Bleeding
Hernia