Medulloblastoma, light micrograph. Embryonal tumours comprise about 20% of pediatric brain tumours. Medulloblastoma is the most commonly seen member of this group. Others include atypical teratoid/rhabdoid tumour and the so-called primitive neuroectodermal tumour. Histologically, they all share the presence of primitive appearing small round blue cells with high N:C ratio, hyperchromatic nuclei and brisk mitotic activity. Medulloblastomas occur in the cerebellum and usually arise from the vermis. The image shows classic (undifferentiated) medulloblastoma composed of small round blue cells.

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達志影像

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