Virchows Archiv A

, Volume 415, Issue 5, pp 467–472 | Cite as

Clear cell ependymoma

A histological variant with diagnostic implications
  • Nobuyuki Kawano
  • Kenzoh Yada
  • Saburo Yagishita
Case Report

Summary

Four cystic brain tumours, one from the frontal lobe, one in the third ventricle and two in the cerebellum, were studied histologically including immunostaining and electron microscopy. Anatomically, all the tumours were located within or adjacent to the ventricular system. By light microscopy, the tumours had a largely honeycomb pattern and were made up of clear cells. Some of the clear cells showed positive for GFAP. Leu 7, Factor VIII and NSE were negative. Electron microscopy of the areas with clear cells revealed densely packed polyhedral cells with clear cytoplasm. They had well developed intercellular junctions, microvilli and some cilia which confirmed their ependymal derivation. Perivascular pseudorosettes or papillary features were only seen in limited areas, where GFAP was strongly positive in the tumour cell processes. As these tumours mimic oligodendroglioma and cerebellar haemangioblastoma, they are called as “clear cell ependymoma” to obviate such errors in diagnosis.

Key words

Ependymoma Clear cells Oligodendroglioma Haemangioblastoma Pathology 

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Copyright information

© Springer-Verlag 1989

Authors and Affiliations

  • Nobuyuki Kawano
    • 1
  • Kenzoh Yada
    • 1
  • Saburo Yagishita
    • 2
  1. 1.Department of NeurosurgeryKitasato University School of MedicineSagamihara, KanagawaJapan
  2. 2.Department of PathologyKanagawa Rehabilitation CenterAtsugi, KanagawaJapan

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