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When a patient has abdominal aortic aneurysm of a substantial size, the patient may also have synchronous (at the same time) and metachronous (developed subsequently) thoracic aortic aneurysm. If causes and conditions are present to create an aneurysm in a large-medium size vessel in one place, you are more likely than those without those causes and conditions to have   (or develop) another aneurysm somewhere. When The pressure from the medium to large aneurysm may also cause arterial dissection where the wall of the artery is tore, and a "false lumen" forms within the wall of the artery and blood can leak into it - leading to rupture.

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