Informations for Patients About Fibrous Dysplasia What is
Fibrous Dysplasia? Fibrous dysplasia is a chronic disorder of
the skeleton that causes expansion of one or more bones due to
abnormal development of the fibrous, or connective, tissue
within the bone. The abnormality will cause uneven growth,
brittleness and deformity in affected bones. Some patients have
only one bone affected (monostotic), whereas other patients have
numerous bones affected (polyostotic). While any bone can be
affected by fibrous dysplasia, the most common sites of the
disease are the femur (thigh bone), tibia (shin bone), ribs,
skull, facial bones, humerus (upper arm), and pelvis. The
vertebrae are less frequently involved. Although many bones can
be affected at once, fibrous dysplasia is not a disease that
spreads from one bone to another. Multiple affected bones are
often found on one side of the body. Who is Affected? Fibrous
dysplasia is a very uncommon disorder, and the total number of
cases is not known. It is usually diagnose