CNS tumor
Diffuse astrocytic and oligodendroglial tumors
Gliosarcoma


Topic Completed: 1 March 2012

Minor changes: 7 August 2020

Copyright: 2002-2020, PathologyOutlines.com, Inc.

PubMed Search: Gliosarcoma CNS

Eman Abdelzaher, M.D., Ph.D.
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Cite this page: Abdelzaher E. Gliosarcoma. PathologyOutlines.com website. http://www.pathologyoutlines.com/topic/cnstumorgliosarcoma.html. Accessed September 30th, 2020.
Definition / general
  • Rare biphasic subtype of glioblastoma, with alternating glial and mesenchymal differentiation (glioblastoma and sarcoma)
  • WHO grade IV
  • May be well circumscribed and resemble meningioma radiologically
  • May progress to pure sarcoma (GFAP-)
  • Rarely expresses epithelial markers or lipid
Radiology description
  • Predominantly sarcomatous tumors appear well demarcated with homogeneous contrast enhancement, may mimic meningioma
Radiology images

Images hosted on other servers:

Various images

Before surgery

Case reports
Gross description
  • Firm, well circumscribed mass (resembling meningioma or metastasis)
Microscopic (histologic) description
  • Glioblastoma (occasionally oligodendroglioma, rarely ependymoma) plus regions of sarcoma resembling fibrosarcoma or malignant fibrous histiocytoma rich in reticulin (collagen+, GFAP-)
Cytology description
  • Highly cellular
  • High grade tumor with mesenchymal and glial components
  • Mesenchymal features may be fibrosarcoma, rhabdoid, osteoclastic giant cell, undifferentiated or heterologous elements
  • Rich arborizing vessels, high mitotic rate, necrosis
  • Glial component has pleomorphic round / oval nuclei, gemistocytes in fibrillary stroma (Diagn Cytopathol 2004;30:77)
Differential diagnosis
  • Glioblastoma: may have desmoplasia but spindled areas lack features of malignancy
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