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Medulloblastoma - MRI
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Iso to mildly T1 hypointense/mixed T2 SI
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Grows circumferentially to fill/obliterate 4V
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Doesn’t usually extend out through foramen of Luschka
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More aggressive lesions invade brainstem and/or
adjacent cerebellar parenchyma
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Haemorrhage, necrosis or cystic change in 20-50%
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Generally strong or heterogeneous enhancement
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DWI: typically restricted diffusion (dark on ADC maps)
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MRS: elevated Choline and Taurine, low NAA