PathogenesisPolyostotis form: 20-30%FD skull and facial bones,,,,, pelvis spine and shoulder girdle. May be unilateral or, bilateral. Initial symptom of pain or associated, pathologic fracture 85%.- FD involving variable number of bone but most, skeleton is normal accompanied by, pigmentation skin caf é - au-lait spots. Jaffe-Lichtenstein syndrome [].Young man exhibiting enlargement of the right maxilla and mandible.Intraoral photograph showing unilateral maxillary expansion.Polyostotic fibrous dysplasia. Jaffe-Lichtenstein syndrome: Caf é au lait pigmentation of the abdomen. This is the same. Patient as shown in previous figure.X-ray.A mixed radiolucent and radio-opaque pattern (ground glass appearance), with displacement of the teeth and distortion of. The nasal cavities.Panoramic radiograph showing ill-defined lesions of the right side of both jaws.Histology.The lesion composed of fibrillar connective tissue within which are numerous trabeculae of course woven immature bone,,, Irregular in shape. The osteocytes are quite large and collagen, fibers of these trabeculae can be seen extending out into. The fibrous tissue. Bone formation by stellate osteoblasts can, be observed although rows of cuboidal osteoblasts lined. Up on the surfaces of trabeculae are absent (osteoblastic riming). These trabeculae typically have wide osteoid seams. Osteoclastic. Activity may be seen where the calcification of osteoid extends to surface of the trabeculae.Immature bone.
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