Some intraventricular or paraventricular neoplasms exhibit the cellular monotony of ependymoma, but inconspicuous, if any, perivascular pseudorosettes. In such cases, the diagnosis of anaplastic ependymoma may be difficult to establish without extensive sampling,immunostaining for GFAP, and perhaps electron microscopy.
The Armed Forces Institute of Pathology
2009-03-21
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