The Journal of Bone and Joint Surgery, Vol 66, Issue 1 53-59, Copyright © 1984 by Journal of Bone and Joint Surgery, Inc
Dedifferentiated parosteal osteosarcoma
LE Wold, KK Unni, JW Beabout, FH Sim and DC Dahlin
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 osteosarcoma.