From the case:
Ependymoma (histology)
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H&E section through an ependymoma demonstrating a "figure 8" ependymal rosette (or ependymal canals); cuboidal tumor cells surrounding an empty lumen. They are far less common than perivascular pseudorosettes (a small perivascular pseudorosette is seen just below and to the left of the true rosette.
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