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Bone cyst

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Introduction
A bone cyst is a fluid-filled hole that develops inside a bone. They mostly occur in children and young adults and often cause no symptoms.
Symptoms of bone cysts
Bone cysts do not usually have any symptoms. They may not be discovered until you fracture (break) the bone, or until you have an X-ray.
Causes of bone cysts
The cause or causes of both unicameral and aneurysmal bone cysts are unclear, although several theories have been suggested.
Diagnosing bone cysts
Bone cysts can usually be diagnosed by looking at an X-ray of your child's bone. This will highlight any hollow cavities or fractures in the bone.
Treating bone cysts
Many bone cysts will heal without any treatment. However, treatment is sometimes necessary if the cyst is painful or to prevent the bone fracturing.