Bone tumour. Lateral X-ray of the knee of a patient with a non-ossifying fibroma (dark grey, below centre) of the tibia, or shin bone. This is a benign (non-cancerous) bone tumour that is made of soft, fibrous tissue. A non-ossifying fibroma is usually symptomless, and no treatment is required as it often resolves on its own. It is the most common benign bone tumour in children.
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