ZEPHYR / SCIENCE PHOTO LIBRARY ZEPHYR / SCIENCE PHOTO LIBRARY
Aortic aneurysm. Coloured 3-D computed tomography (CT) scan of an aneurysm (centre) in the abdominal aorta (pink) seen in side (sagittal) view. An aneurysm is an abnormal blood-filled dilation in an artery, caused by weakening of the arterial wall. The abdominal aorta is the largest artery below the diaphragm. This image is at the level of the coeliac branch that carries blood to the stomach, liver and spleen, and the mesenteric artery, which supplies the small intestine. The spinal vertebrae (down left) show evidence of arthrosis, a degenerative joint disease where the cartilage in joints wears away and new bone forms, which may limit spinal movement and cause pain.
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