AJ PHOTO / HOP AMERICAIN / SCIENCE PHOTO LIBRARY AJ PHOTO / HOP AMERICAIN / SCIENCE PHOTO LIBRARY
Kidney stone X-ray. Radiologist using a pen to indicate the position of a kidney stone on an X-ray. Kidney stones are hard deposits of urine salts that can form in the kidneys. They can cause severe pain, urine retention and kidney damage. They are generally treated by lithotripsy, the use of focused ultrasonic sound waves to break them into smaller particles, which are then expelled in the urine.
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