Retroperitoneal extraskeletal osteosarcoma misconstrued as a primary renal tumor

Byung Hyun Soh, Woong Kyu Han, Seung Hwan Lee, Jieun Kwon, Woo Ick Yang, Seung Choul Yang

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1 Citation (Scopus)


Extraskeletal osteosarcoma is a rare malignant tumor of the soft tissue. In addition, there are only several reported cases of osteosarcoma of the retroperitoneum as a primary site. We report here on a case of extraskeletal osteosarcoma arising in the retroperitoneum. An 80-year-old man visited our hospital because of a known renal mass. Abdominal computed tomography showed a 10cm sized huge renal mass. We then performed radical nephrectomy. The mass revealed a solid and ivory-colored cut surface with multifocally ovoid cystic spaces and hemorrhage. Microscopically, the tumor consisted of polygonal stromal cells, giant cells and varying amounts of neoplastic new bone; mitotic figures were frequently observed. There was no distant metastasis or regional lymph node involvement.

Original languageEnglish
Pages (from-to)1124-1126
Number of pages3
JournalKorean Journal of Urology
Issue number10
Publication statusPublished - 2006 Oct

All Science Journal Classification (ASJC) codes

  • Urology


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