9 Cerebrum HP Same. Most frequent malignant brain tumor in children. Note marked hypercellularity of small, dark blue cells without definite architectural pattern. 12 Cerebellum HP Medulloblastoma. Note closely spaced cells with angular, hyperchromatic, carro-shaped nuclei.
Necrosis is seen as individual pyknotic nuclei.
Mitoses are frequent and there are few Homer Wright rosettes with central eosinophilic fibrillar material. Note common parasagittal location. Note compression but not invasion of the brain. 15 Brain LP Meningioma. 16 Brain MP Same.