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exostosis (ek″sos-to´sis)   a benign new growth projecting from the surface of a bone. It usually is covered with cartilage. adj., exostot´ic., adj.

exostosis cartilaginea  a variety of osteoma consisting of a layer of cartilage developing beneath the periosteum of a bone.

hereditary multiple exostoses  , multiple cartilaginous exostoses  a generally benign, hereditary disorder of bone growth, in which exostoses form near the ends of the shafts of long bones.

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