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Unicameral bone cyst
A unicameral bone cyst, also known as a simple bone cyst, is a cavity filled with a yellow-colored fluid. It is considered to be benign since it does not spread beyond the bone.〔(【引用サイトリンク】url=http://childrenshospital.org/az/Site642/mainpageS642P0.html )〕 Unicameral bone cysts can be classified into two categories: active and latent.〔 An active cyst is adjacent to the epiphyseal plate and tends to grow until it fills the entire diaphysis, the shaft, of the bone; depending on the invasiveness of the cyst, it can cause a pathological fracture or even destroy the epiphyseal plate leading to the permanent shortening of the bone.〔 A latent cyst is located away from the epiphyseal plate and is more likely to heal with treatment.〔 It is typically diagnosed in children from the aged 5 to 15.〔 Although unicameral bone cysts can form in any bone structure, it is predominantly found in the proximal humerus and proximal femur; additionally, it affects males twice as often as females.〔
==Origins==
There is not a specific theory behind the etiology of the unicameral bone cyst, however, according to many researchers and doctors, there is a commonly known theory hypothesized by Jonathan Cohen in 1970.〔 Cohen studied interstitial fluid in six children undergoing treatment for unicameral bone cysts.〔 He believed that the chemical composition of the fluid found in the bone cyst was similar to the chemical make-up in serum. Cohen theorized that the unicameral bone cyst occurs when interstitial fluids in cancellous bones quickly accumulate in one region from blockage.〔
One of the other theories is that the cysts result from a disorder of the growth plate. Another is that the cysts result from problems with circulation that are caused by a developmental anomaly in the veins of the affected bone. The role trauma plays in the development of these cysts is unknown. Some speculate that repeated trauma puts the bone at risk for developing a bone cyst. This, however, has not been proven.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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