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 (round blue structure) called an aneurysm. The central red portion within the larger blue structure (aneurysm) is the patent lumen. The area in blue surrounding the red patent lumen is thrombus (blood clot within the aneurysm). The smaller purple structure to the left is the inferior vena cava.
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