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Parosteal osteosarcoma (OSA) is a slow-growing, low-grade malignant bone-forming tumor (grade 1–2) arising from the outer layer of the periosteum. Dedifferentiated parosteal osteosarcoma (DPOS) is histologically higher-grade sarcoma (grade 3–4) that coexists with a conventional low-grade parosteal OSA.

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Parosteal Osteosarcoma

  • 章节

  • 发表日期：

    2025年

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  • Won-Jong Bahk

摘要

Parosteal osteosarcoma (OSA) is a slow-growing, low-grade malignant bone-forming tumor (grade 1–2) arising from the outer layer of the periosteum. Dedifferentiated parosteal osteosarcoma (DPOS) is histologically higher-grade sarcoma (grade 3–4) that coexists with a conventional low-grade parosteal OSA.