ZEPHYR / SCIENCE PHOTO LIBRARY ZEPHYR / SCIENCE PHOTO LIBRARY
Doppler ultrasound scan (sagittal view, at left) of the abdominal aorta artery (red) showing blood flow and stenosis (narrowing) at the junction of the superior mesenteric artery. An X-ray (at right) also shows the narrowing in the dark artery as it runs next to the bones of the spine.
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