CAVALLINI JAMES / BSIP / SCIENCE PHOTO LIBRARY CAVALLINI JAMES / BSIP / SCIENCE PHOTO LIBRARY
Osteoid osteoma. Magnetic resonance imaging (MRI) scan of osteoid osteoma (small blue circle at top right of white circle) in the left femur (thigh bone). This is a rare, benign (non-cancerous) tumour that causes deep pain. The tumour typically measures less than half a centimetre and most commonly affects the long bones of the arms and legs.
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