Ependymal rosettes (ependymoma)

Ependymal rosettes correspond to a histologic architectural pattern that very characteristic of ependymomas, as tumour cells form structures similar to the lining of normal ventricles. They are characterised by a halo or spoke-wheel arrangement of tumour cells surrounding an empty central tubule lumen.

They should not be confused with the far more common perivascular pseudorosettes

Differential diagnosis

In addition to perivascular pseudorosettes, an ependymal rosette should be differentiated from:

  • Homer Wright rosette: central lumen filled with fiber-like processes
  • Flexner-Wintersteiner rosette: central lumen contains small cytoplasmic extensions of the encircling cells
  • pineocytomatous and neurocytic rosettes:  generally larger and more irregular in contour
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Article information

rID: 34057
Section: Pathology
Tags: refs, cases
Synonyms or Alternate Spellings:
  • True ependymal rosette
  • Ependymal rosettes

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