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Of 55 patients with Ollier's disease seen at the Mayo Clinic between 1907 and 1985, 16 had malignant bone neoplasms: 12 chondrosarcomas, two dedifferentiated chondrosarcomas, one chordoma, and one osteosarcoma. One patient had a chondrosarcoma in two different bones. These findings suggest that approximately 30% of patients with Ollier's disease will develop a malignant bone neoplasm, most probably chondrosarcoma. The prognosis for most patients is good. Five of the 16 patients survived more than 13 years after treatment.
Liu et al. (Wed,) studied this question.