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Figure 2: (a) Photomicrographs show a tumor composed of monomorphic round cells with interspersed fibrillary areas and thin vascular channels. (b) The tumor cells have uniform round nuclei with speckled chromatin and show increased mitotic activity. (c) On immunohistochemistry, the tumor cells show positivity for synaptophysin, and (d) nuclear NeuN positivity. (e) GFAP highlights entrapped reactive astrocytes, while tumor cells are negative. (f) MIB-1 LI is elevated

Figure 2: (a) Photomicrographs show a tumor composed of monomorphic round cells with interspersed fibrillary areas and thin vascular channels. (b) The tumor cells have uniform round nuclei with speckled chromatin and show increased mitotic activity. (c) On immunohistochemistry, the tumor cells show positivity for synaptophysin, and (d) nuclear NeuN positivity. (e) GFAP highlights entrapped reactive astrocytes, while tumor cells are negative. (f) MIB-1 LI is elevated