DR NAJEEB LAYYOUS / SCIENCE PHOTO LIBRARY DR NAJEEB LAYYOUS / SCIENCE PHOTO LIBRARY
Gallstones. Ultrasound scan of a large gallstone (pale grey) in the gallbladder (dark oval) of a patient. 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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