A bone cyst is a hole filled with fluid that develops inside a bone, according to WebMD. Children and young adults are vulnerable to this condition. Bone cysts do not cause any symptoms, they have no cancer cells and they do not pose any health risks.
In some cases, bone cysts grow larger, weakening the bones and increasing the risk of fractures, notes WebMD. This causes several symptoms, including moving difficulty, swelling and pain.
There are two forms of bones cysts: unicameral bone cysts and aneurysmal bone cysts. Unicameral bone cysts occur in any bone in the body, and they do not require treatment. They are common in children between the age of 5 to 15, and they affect more boys than girls. Aneurysmal bone cysts also occur on any body part but are more common in the vertebral bones and the bones of the lower leg, thigh or upper arm. They are rare and affect young adult between 10 to 20 years old.
Most cases of bone cysts clear up after about 6 months without treatment, states WebMD. If treatment is necessary, doctors often use steroid injections to support the healing of the cysts. However, there is a chance that the cysts can recur after 2 years.