Malignant change in a patient with multiple enchondromas


This patient with multiple enchondromas developed pain on the left side of the pelvis
The ileum has a fuzzy contour and the lesion is calcified.The calcification has a "popcorn" appearance.This is at the * area of the above x ray.
At the superior acetabulum. Marked with the arrow above, the bony trabeculae can still be seen. This is a normal enchondroma. The cartilage cap is usually not seen on plain x ray.

Suspect malignant change in an osteochondroma when:-

  • Growth of the lesion in an adult
  • >1cm cartilage cap (MRI or CT scan)
  • Area of fluffy density
  • Soft tissue invasion takes place