Figure legends:
Figure 1: Radiologic findings of the primitive neuroectodermal tumor.
(A) T1-weighted MRI showing a mass with mixed isointense to hypointense
signals in left frontoparietal lobe. (B) CT scan demonstrating a large
mass with isodensity signals. (C, D) Post-contrast MRI showing a mass
with heterogeneous enhancement in the left frontoparietal lobe.
Figure 2: Histopathologic findings. (A) An undifferentiated and densely
cellular tumor. (B, C) Small, round, uniform cells infiltrating the
brain tissue. (D) Round cells with scant cytoplasm. (E, F) Diffuse
membranous positivity for CD99. Scale bars: 100 μm (A), 50 μm (B, C, E).
20 μm (D, F)