“Vision is the art of seeing things invisible.” Jonathan Swift 1667 - 1745 Benign Fibro-osseous Lesions Plus… Steven R. Singer, DDS
[email protected] 212.305.5674 Benign Fibro-osseous Lesions Fibrous Dysplasia A group of lesions in which normal bone is Localized change in bone metabolism replaced initially by fibrous connective tissue Normal cancellous bone is replaced by Over time, the lesion is infiltrated by osteoid fibrous connective tissue and cementoid tissue The connective tissue contains varying amounts of abnormal bone with irregular This is a benign and idiopathic process trabeculae Trabeculae are randomly oriented. (Remember that normal trabeculae are aligned to respond to stress) Fibrous Dysplasia Fibrous Dysplasia Lesions may be solitary (monostotic) or Fibrous dysplasia is non-hereditary involve more than one bone (polyostotic) Caused by a mutation in a somatic cell. Monostotic form accounts for 70% of all Extent of lesions depends on the timing of cases the mutation. Polyostotic form is more common in the first If the mutation occurs earlier, the disease decade will be more widespread throughout the M=F except in McCune-Albright syndrome, body. An example is McCune-Albright which is almost exclusively found in females Syndrome 1 Fibrous Dysplasia Fibrous Dysplasia McCune-Albright Syndrome • Monostotic and polyostotic forms usually -Almost exclusively begins in the second decade of life females -Polyostotic fibrous • Slow, painless expansion of the jaws dysplasia • Patients may complain of swelling or have