The gene for the most common type of FSH is located on chromosome No. 4. This disorder generally appears when a person is in early adolescence, but it can also appear in young adulthood or childhood. It can usually be detected earlier by clinical examination in a family where there is a positive family history. The progression of facioscapulohumeral muscular dystrophy is typically slow, with long periods of time when the disorder seems to stop Progressing altogether. As the trunk and leg muscles become involved, persons with this disorder may lose their ability to walk.
Life span is often normal.
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