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[edit] Discussion

  • AKA Exostosis.
  • Most common benign tumor or tumorlike lesion of bone.
  • Composed of cortical and medullary bone with an overlying hyaline cartilage cap.
  • It is the continuity of this lesion with the underlying native bone cortex and medullary canal that is pathognomonic of osteochondroma.
  • These lesions result from the separation of a fragment of epiphyseal growth plate cartilage, which subsequently herniates through the periosteal bone cuff that normally surrounds the growth plate
  • Lesions may be solitary or multiple, with the latter associated with the syndrome hereditary multiple exostoses (HME).
  • Complications are commonly associated with these exophytic masses and include
    • Cosmetic and osseous deformity
    • Fracture
    • Vascular compromise
    • Overlying bursa formation
    • Malignant transformation.
  • Variants of osteochondroma:

[edit] Imaging Findings

[edit] Plain film

  • Sessile or pedunculated bone protuberance arising from the external bone surface and containing spongiosa and cortex that are continuous with those of the parent bone
  • Typically, osteochondromas tend to point away from the nearby joint and toward the diaphysis. Widening of the metaphysis of tubular bones may be evident.

[edit] Images

Patient #1: Rib osteochondroma

Patient #2

Patient #3: Subungual exostosis

[edit] See Also

[edit] External Links

[edit] References