: Ollier's disease or multiple enchondromatosis is a deforming dysplastic disease of cartilage involving primarily the metaphyses and diaphyses of long bones. It is only rarely associated with sarcomatous degeneration of the enchondromas or other generalized neoplasms. A related disease, Maffucci's syndrome, is, however, associated with generalized tumors. We present the case of a 29-year-old, albino, black man with Ollier's disease who, as a child, underwent a number of orthopedic procedures for multiple limb deformities and fractures. At age 25, he developed hydrocephalus, progressive cranial nerve palsies, and a large enchondroma of the skull base. He subsequently underwent multiple shunt procedures and two suboccipital craniectomies. Eighteen months later, a brain computed tomographic (CT) scan revealed an intracerebellar mass, which was found to be an anaplastic astrocytoma. Two years later, he developed a right hemiparesis and sensory dysfunction with a diffuse supratentorial mass on CT scan. A stereotactic biopsy showed this to be a similar anaplastic astrocytoma. The literature concerning Ollier's disease is reviewed, and the intracerebral lesions associated with both Ollier's disease and Maffucci's syndrome are examined. (Neurosurgery 21:400-403, 1987)
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