Intriguing case: Primitive pelvic sarcoma resembling clear cell sarcoma of kidney

Douglas A. Weeks, Richelle L. Malott, Craig Zuppan, Gary W. Mierau, J. Bruce Beckwith

Research output: Contribution to journalArticlepeer-review


Clear cell sarcoma of kidney (CCSK) is an aggressive childhood renal tumor of unknown histogenesis that has not been reported to occur outside the kidney. The article describes an extrarenal neoplasm arising in the pelvic soft tissues of a 13-year-old boy that was composed predominantly of uniform mesenchymal cells with optically clear cytoplasm supported by an arborizing network of small blood vessels, which was indistinguishable in appearance from CCSK. The electron microscopic findings, although nonspecific, were essentially identical to those of CCSK, with tumor cells displaying fine chromatin, electron-lucent cytoplasm, and intercellular collagen but no evidence of tissue-specific differentiation. Immunocytochemical studies showed positivity for vimentin but negative results for desmin, myoglobin, cytokeratin, epithelial membrane antigen, S-100 protein, neuron-specific enolase and factor VIII-related antigen. Tumor cells were also nonreactive with Ulex lectin. This unusual pelvic tumor and CCSK may both derive from primitive mesenchymal cells and may represent phenotypic but not necessarily histogenetic analogs.

Original languageEnglish (US)
Pages (from-to)409-416
Number of pages8
JournalUltrastructural Pathology
Issue number4-5
StatePublished - 1991
Externally publishedYes


  • Childhood sarcoma
  • Clear cell sarcoma of kidney
  • Electron microscopy
  • Immunocyto-chemistry
  • Primitive sarcoma

ASJC Scopus subject areas

  • Pathology and Forensic Medicine
  • Structural Biology


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