Features of polyostotic expansile benign bone disease; known polyostotic fibrous dysplasia with the above-described involvement and mass effect of the thoracic spine involvement and secondary aneurysmal bone cyst change of the thoracic spine lesion. Fibrous dysplasia occurs rarely in the spine, especially in the thoracic spine. Fibrous dysplasia of the spine usually occurs as a part of the polyostotic form of the disease.

See case (rID-42871) for craniofacial manifestations in this patient.