A thrombus is a blood clot. It is attached to the wall of the blood vessel. If it dislodges to flow thru the blood stream then the blood clot is called an embolus.
Oftentimes the terms 'blood clot and thrombus' are used interchangeably clinically. However, it is important to note that a 'clot' is the result of the coagulation cascade (e.g. such that it can occur in a vial), while a thrombus refers to BOTH the coagulation cascade occurring AND the aggregation of platelets on the side of a vessel.
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A thrombus is a blood clot that forms in any vessel and stays there. An embolism is a traveling clot moving from where it formed to another location in the body. Either can lodge in a blood vessel and block the flow of blood.
An embolism is a blood clot, an aneurysm is the breaking of a weak spot in a blood vessel
A blood clot that forms in the vein is the thrombus. Anything that travels through the blood vessels until it reaches a blocked blood vessel is a embolus.
A thrombosis and embolism are similar because they both form blood clots. However, a thrombosis is stationary while an embolism usually travels.
A thrombosis is a blood clot that stays put where it was formed. An embolism is a blood clot that breaks loose and travels through the blood stream.