pathology_of_human_tumor: h&e stained slides show a neoplastic proliferation of cells. the cells have round to ovoid nuclei with speckled cytoplasm and are forming perivascular pseudorosettes. focal areas have hemorrhage and geographic necrosis, though the vast majority of tissue is viable. in many areas, the neoplasm is quite cellular. mitoses are present but number less than 5 per 10 hpf in a random count (selected areas have more than 10 mitoses per 10 hpf). rare foci of vascular proliferation are present, separate from zones of necrosis or granulation tissue.