Embolism can cause occlusion in any part of the body. It is a major cause of tissue death from blockage of the blood supply. Embolus lodging in the brain from either the heart or a carotid artery will most likely be the cause of a stroke due to ischemia. The early recognition and operative treatment of embolic arterial occlusion of the extremities is still relatively infrequent. An embolic stroke occurs when a blood clot that forms elsewhere in the body breaks loose and travels to the brain via the bloodstream. When the clot lodges in an artery and blocks the flow of blood, this causes a stroke. The presence of occlusion can be determined noninvasively. Acute limb ischemia (ALI) results from a sudden obstruction in the arterial flow to the extremity due to an embolism or thrombosis. Acute occlusion of the abdominal aorta requires rapid diagnosis and intervention to prevent loss of life or limb. A condition in which one or more arteries in the lungs become blocked by a blood clot(Pulmonary occlusion). A pulmonary embolism is a blood clot that occurs in the lungs.