Dedifferentiated parosteal osteosarcoma with a novel low-grade leiomyosarcomatous and high-grade conventional osteosarcomatous differentiation: Case report and review of literature

This case presenting a distinctive pattern of dedifferentiation is, to our knowledge, the first documented case of low-grade leiomyosarcoma occurring in parosteal osteosarcoma. As it enhances the clinical understanding by broadening the range of dedifferentiated components identified in parosteal osteosarcoma and highlights the diagnostic difficulties associated with these uncommon bone tumors.