Dedifferentiated parosteal osteosarcoma.

  title={Dedifferentiated parosteal osteosarcoma.},
  author={Lester E. Wold and Krishnan K. Unni and John W. Beabout and Franklin H. Sim and David C. Dahlin},
  journal={The Journal of bone and joint surgery. American volume},
  volume={66 1},
Parosteal osteosarcoma is an uncommon malignant tumor of bone, and in a review of Mayo Clinic records we identified eleven cases of so-called dedifferentiated parosteal osteosarcoma. Ten of the eleven patients had had a long history of treatment for multiple recurrences of the tumor as a low-grade parosteal osteosarcoma and then for a definite recurrence as a high-grade undifferentiated osteosarcoma. The prognosis in this group of patients was similar to that in patients with conventional… CONTINUE READING
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