DefinitionBy Mayo Clinic staff
Fibrous dysplasia is a bone disorder in which scar-like (fibrous) tissue develops in place of normal bone. As the bone grows, the softer, fibrous tissue expands, weakening the bone. Fibrous dysplasia can cause the affected bone to deform and become susceptible to fracture.
Most people with fibrous dysplasia are diagnosed during adolescence or early adulthood. Mild cases usually cause no signs or symptoms. More-serious cases of fibrous dysplasia may result in bone pain and deformity.
The basic cause of fibrous dysplasia is unknown. There's no cure for fibrous dysplasia. Treatment focuses on relieving signs and symptoms.
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