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[edit] Discussion

  • Intramedullary benign cartilaginous neoplasms
  • Ectopic hyaline cartilage rests in intramedullary bone.
  • Lesions replace normal bone with mineralized or unmineralized hyaline cartilage, thereby generating a lytic area containing rings and arcs of chondroid calcifications.
  • Lesions probably arise from cartilaginous rests that are displaced from the growth plate.
  • Predilection for small bones of the hands and the feet (less commonly).
  • Other locations are the long bones, shoulder, and pelvis.
  • Metaphyseal region in the longer bones.
  • Enchondromas tend to occupy the diaphyseal region in the short tubular bones

  • Signs and Symptoms of Malignant Transformation
    • Pain
    • Enlarging lesion
    • Pathological fracture
    • Soft tissue mass
    • Disappearance of preexisting calcifications

[edit] Imaging Findings

[edit] Plain Film

  • Lesions in hands in feet:
    • Well defined lytic lesion with lobulated contours
    • Endosteal erosion
    • Some degree of calcification may be present
  • Lesions in long bones
    • Lesion with “arcs and rings” chondroid matrix

[edit] CT

  • Same as radiographic features
  • Well defined with lobulated contours
  • Endosteal erosion
  • Chondroid matrix

[edit] MRI

  • T1: low signal intensity
  • T2: high signal intensity
  • Calcified foci appear as low signal intensity on T1 and T2 images

[edit] Images

Patient #1: Enchondroma with a pathological fracture

Patient #2

Patient #3

[edit] See Also

[edit] External Links

[edit] References

  • Flemming DJ, Murphey MD. Enchondroma and chondrosarcoma. Semin Musculoskelet Radiol. 2000;4(1):59-71.
  • Manaster BJ, Disler D, May D. Musculoskelatal Imaging: The Requisites. 2nd Edition. Mosby, 2002.
  • Resnick, Donald. Diagnosis of Bone and Joint Disease. 4th Edition. W.B. Saunders Company, 2002.

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