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Chondrosarcoma is the commonest primary malignant bone tumor in the age group of 40—60 years.
  1. It mostly involves pelvis (30%); femur (20%), ribs (10%), femoral head (10%), shoulder girdle, sternum & vertebrae.
  2. It commonly presents with dull aching pain and gradually enlarging mass. Radiological features-include-expansile, centric, metaphyseal radiolucent lesion with central flecks of calcification (mottled or punctate calcification or popcorn balls).
  3. There is poorly marginated bone destruction causing endosteal scalloping, cortical expansion and gradual erosion of cortex.
  4. Treatment: Surgical Excision

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