De novo osteosarcoma following prolonged denosumab treatment for giant cell tumor of bone at an anatomically distant site: a case report.
Katherine Elon Burbank, Robert Mikael Henshaw, James Stephen Jelinek et al.
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Case in brief
A patient treated with prolonged denosumab for giant cell tumor of bone (GCTB) developed osteosarcoma at an anatomically distant site from the original tumor. The report describes the osteosarcoma as de novo, rather than arising within the GCTB. The abstract notes diagnostic challenges and therapeutic considerations but provides no further clinical findings, investigations, or outcome details.
What made this case unusual
The osteosarcoma arose at a distant site, not within or from the original GCTB—unlike previously described denosumab-associated cases, which involved the existing tumor.
Diagnostic / clinical pearl
When osteosarcoma is identified after denosumab treatment for GCTB, assess whether it arose within the original lesion or at a separate site; the distinction is central to interpreting the case.