Chondroma classification

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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1];Assistant Editor-in-Chief: Somal Khan Soujanya Thummathati, MBBS [2]

Overview

Chondromas may be classified into two broad types based on their location: enchondromas (tumor grows within the bone and expands it) and ecchondroma (tumor grows outward from the bone).

Classification

• Chondroma may be classified according to the matrix, or substance, that they produce into 4 subtypes:
  • Osteoid or bone forming tumors
    • Osteoid osteoma
    • Osteoblastoma
  • Cartilage forming tumors
    • Osteochondroma (exostosis)
    • Chondroma (enchondroma, periosteal chondroma)
    • Chondroblastoma
    • Chondromyxoid fibroma
  • Fibrous lesions
    • Fibrous dysplasia
    • Ossifying fibroma (osteofibrous dysplasia)
    • Nonossifying fibroma
  • Cystic and vascular lesions
    • Unicameral bone cyst
    • Aneurysmal bone cyst

• There is a less common classification for chondroma based on their anatomic locations:
  • Chondroma of tip of the nose
  • Extraskeletal chondroma of the scalp
  • Intracranial chonrdoma
  • Sacrococcygeal chonrdoma
  • Skull base chonrdoma
  • Spinal chonrdoma

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