CNS tumor

Ependymal tumors

Anaplastic ependymoma

Topic Completed: 1 August 2012

Minor changes: 25 September 2020

Copyright: 2002-2021,, Inc.

PubMed Search: Anaplastic ependymoma [title]

Eman Abdelzaher, M.D., Ph.D.
Page views in 2020: 5,343
Page views in 2021 to date: 4,687
Cite this page: Abdelzaher E. Anaplastic ependymoma. website. Accessed September 22nd, 2021.
Definition / general
  • Grade III of IV
  • Rare; usually infants and children
  • Often cerebrum or cerebellum of children / young adults but all ages and locations
  • Infiltrates leptomeninges, spreads along CSF pathways like medulloblastoma
Case reports
Microscopic (histologic) description
  • Marked hypercellularity, nuclear atypia and brisk mitotic activity
  • May have intramural or glomeruloid vascular proliferation, pseudopalisading necrosis, perivascular rosettes
  • Discrete or infiltrative margin
  • Nonpalisading necrosis is not sufficient for diagnosis in otherwise low grade ependymoma
Microscopic (histologic) images

Contributed by Roopa Arora, M.D. (Case #427)
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