The provider places an extension prosthesis in the descending aorta using a guidewire. He commonly performs this procedure to repair an endoleak in the descending thoracic aorta that had been previously grafted due to an aneurysm, pseudoaneurysm, dissection, penetrating ulcer, intramural hematoma, or traumatic disruption. These endoleaks are due to an exclusion of the aneurysm, which causes backflow of blood into the aneurysm.
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