ZEPHYR / SCIENCE PHOTO LIBRARY ZEPHYR / SCIENCE PHOTO LIBRARY
Gallstone. Frontal X-ray of a large gallstone (white circle, upper right) in a 90-year-old woman's abdomen. Gallstones are bodies formed by the hardening of deposits of cholesterol and bile salts. The stones lead to attacks of extreme pain in the abdomen after fatty meals. Treatment can be non-invasive (broken down by drugs or ultrasound) or invasive (surgical removal).
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