Enchondroma vs low grade chondrosarcoma

Distinguishing between enchondromas and low-grade conventional chondrosarcomas is a frequent difficulty as the lesions are both histologically and radiographically very similar.

Radiographic features

Features which are useful include:

  • cortical breach
    • seen in 88% of long bone chondrosarcomas
    • seen in only 8% of enchondromas
  • scalloping involving > 2/3 of cortical thickness
    • seen in 90% of chondrosarcomas
    • seen in only 10% of enchondromas
  • permeative or moth-eaten bone appearance
    • seen in high-grade chondrosarcomas, not in low-grade tumours
  • soft tissue mass beyond bone
    • not seen in enchondroma
  • increased uptake on bone scan
    • seen in 82% of chondrosarcomas
    • seen in only 21% of enchondromas
  • location
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Article Information

rID: 6245
Section: Gamuts
Synonyms or Alternate Spellings:
  • Enchondroma vs low grade chondrosarcoma

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    Case 1: chrondrosarcoma - cortical scalloping >2/3
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    Case 2: chondrosarcoma - increased uptake
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