Dedifferentiated parosteal osteosarcoma with high-grade osteoclast-rich osteogenic sarcoma at presentation.
case_report · Level V
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Abstract
We report a case of a 32-year-old woman who presented with parosteal osteosarcoma of the distal femur with simultaneous dedifferentiation to a high-grade osteoclast-rich osteogenic sarcoma. This pattern of dedifferentiation is rare, particularly at the time of presentation. We are aware of three other somewhat comparable cases in the literature; however, none is quite similar to our case.
Medical subject headings
- Femoral Neoplasms
- Neoplasms, Second Primary
- Osteoclasts
- Osteosarcoma
- Osteosarcoma, Juxtacortical
Anatomy
- femur