LIVING ART ENTERPRISES, LLC / SCIENCE PHOTO LIBRARY LIVING ART ENTERPRISES, LLC / SCIENCE PHOTO LIBRARY
This axial (cross section) CT through the lower abdomen of an elderly male shows an enlarged lower abdominal aorta called an aneurysm. The central portion within the aneurysm is the patent lumen. The area surrounding the patent lumen is thrombus (blood clot within the aneurysm). The smaller structure to the left is the inferior vena cava.
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