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Osteochondroma / Osteocartilaginous Exostosis


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 a developmental dysplasia of peripheral growth plate which forms a cartilage capped projection of bone found near metaphyses of long bones;
          - peripheral chondroblast grows outward from the metaphysis, acting as an ectopic growth plate, which ceases growth at skeletal maturation;
          - hence, there is an excrescene of trabecular bone capped by a thin zone of proliferating cartilage;
    - it is the most common benign bone tumor;
    - usually occurs in long bones, but may occur any bone that is preformed in cartilage.




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