ZEPHYR / SCIENCE PHOTO LIBRARY ZEPHYR / SCIENCE PHOTO LIBRARY
Knees in Ollier disease. X-rays of sections through the knees of a 22-year-old patient with Ollier disease, showing benign (non-cancerous) cartilage tumours (upper centre left and right) on the inside of the tibias (thigh bones). Ollier disease is a rare disorder that causes the growth of benign cartilaginous tumours within the bone (enchondroma).
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