ZEPHYR / SCIENCE PHOTO LIBRARY ZEPHYR / SCIENCE PHOTO LIBRARY
Brain tumour. Coloured magnetic resonance imaging (MRI) scan of a sagittal section through the head of a 23-year-old patient with a lesion (dark patch, centre-right) in the cerebellum indicative of the presence of a medulloblastoma. Medulloblastoma is a highly malignant (cancerous) primary brain tumor that originates in the cerebellum or posterior fossa regions of the brain. It is invasive and rapidly growing tumours and, unlike most brain tumours, spreads through the cerebrospinal fluid and frequently metastasizes to different locations in the brain and spine.
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