Low-grade central osteosarcoma resembling fibrous dysplasia. A report of two cases.

We describe 2 cases of low-grade central osteosarcoma mimicking fibrous dysplasia and present a review of the literature. These cases illustrate the importance of obtaining a large representative sample of tumor in suspicious lesions, because it may be difficult or impossible to histologically distinguish low-grade central osteosarcoma from a benign lesion with limited samples from a core biopsy or needle aspiration. The treatment of choice for low-grade central osteosarcoma is resection with wide surgical margins or, if limb salvage is not technically feasible, amputation.