Symptoms are pain and deformity of the involved bone with pathologic fracture.
Extensive proliferation of fibrous tissue which destroys and replaces normal bone. A single bone is involved. A cystic lesion can be found in the shafts of the tubular, flat, and round bones. The lesion has a ground glass appearance due to calcification of the tumor matrix. The cortex can be expanded and thin, and the spongiosa can be sclerotic.