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Infratentorial ependymomas of childhood

Correlation between histological features, immunohistological phenotype, silver nucleolar organizer region staining values and post-operative survival in 16 cases

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Summary

We have examined pathological criteria in 16 cases of infratentorial ependymomas of childhood using a conventional histological approach, with immunohistochemistry and silver nucleolar organizer region staining (AgNORs). We have found that some of these criteria are of prognostic value. The following histological features were evaluated in each case: cellular density, cellular or nuclear pleiomorphism, mitosis, focal necrosis, endothelial proliferation and complete loss of differentiation. The expression of the following antigens was also studied: epithelial membrane antigen (EMA), human natural killer (HNK1), glial fibrillary acidic protein (GFAP) and vimentin. Only three histological criteria have been retained as indicative of bad prognosis, i.e., high mitotic index, a large amount of necrosis and complete loss of differentiation. These criteria distinguish ependymomas from anaplastic ependymomas. GFAP was expressed in all tumors while other antigens were more variable. In addition tumors expressing large amounts of GFAP were statistically associated with a better prognosis. Increased vimentin expression associated with a decrease of GFAP immunoreactivity correlated with anaplasia and short survival. EMA was not directly correlated with postoperative survival but may be considered as a further prognostic factor. Finally AgNORs values were not statistically correlated with postoperative survival.

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Authors and Affiliations

  1. Laboratoire d'Anatomie Pathologique et de Neuropathologie, CHU Timone, 27 Bd Jean Moulin, F-13005, Marseille, France

    D. Figarella-Branger, D. Gambarelli, B. Devictor, A. M. Perez-Castillo & J. F. Pellissier

  2. Service de Neurochirurgie Pédiatrique, CHU Timone, 27 Bd Jean Moulin, F-13005, Marseille, France

    C. Dollo, L. Genitori, G. Lena & M. Choux

Authors
  1. D. Figarella-Branger
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  2. D. Gambarelli
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  3. C. Dollo
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  4. B. Devictor
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  5. A. M. Perez-Castillo
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  6. L. Genitori
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  7. G. Lena
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  8. M. Choux
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  9. J. F. Pellissier
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Figarella-Branger, D., Gambarelli, D., Dollo, C. et al. Infratentorial ependymomas of childhood. Acta Neuropathol 82, 208–216 (1991). https://doi.org/10.1007/BF00294447

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  • DOI: https://doi.org/10.1007/BF00294447

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