PMC5292372_01
Noncontrast axial computed tomography image shows a mixed solid (dashed white arrow) and cystic (solid white arrow) temporooccipital mass with a hyperattenuating solid component and a punctate calcification peripherally (dotted white arrow).
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fig1
The mass caused effacement of the occipital horn and atrium of the left lateral ventricle as well as trapping of the temporal horn (Figure 1).
Precontrast axial T1 weighted image shows the solid component (dotted white arrows) to be hypointense to grey matter with small areas of T1 hyperintensity (solid white arrows) seen peripherally within the cystic (dashed white arrow) and solid components, likely representing areas of focal hemorrhage.
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fig2
MRI of the brain revealed a heterogeneously enhancing, mixed cystic and solid mass (Figures 2, 3, and 4).
Postcontrast axial T1 weighted MR image demonstrates avid heterogeneous enhancement in the solid component (dashed white arrow) with rim enhancement of the cystic component.
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fig3
MRI of the brain revealed a heterogeneously enhancing, mixed cystic and solid mass (Figures 2, 3, and 4).
T2 weighted axial image shows a mixed solid (dashed white arrow) and cystic (solid white arrow) temporooccipital mass with a heterogeneous, bubbly appearance of the solid component.
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fig4
MRI of the brain revealed a heterogeneously enhancing, mixed cystic and solid mass (Figures 2, 3, and 4).
H&E stain demonstrating a perivascular pseudorosette with blunted end foot plates of the tumor cells directed toward a central blood vessel (40x).
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fig5
These cells demonstrated perivascular distribution in a pseudorosette pattern with broad cytoplasmic processes radiating toward the centrally placed blood vessels (Figure 5).
Glial fibrillary acidic protein (GFAP) stain shows positive staining demonstrating the glial origin of tumor cells (20x). Again, we can appreciate the tumor cells arranged in a perivascular pseudorosette with tumor cells directed toward the central blood vessel and the lack of fibrillarity.
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fig6
The glial fibrillary acidic protein (GFAP) stain showed extensive cytoplasmic positivity (Figure 6).