Axial T1
Axial T2
Coronal T2
Coronal FLAIR
Axial DWI
Axial ADC
Coronal T1 C+
Sagittal T1 C+
Axial T1 C+
What is the most likely diagnosis?
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Medulloblastoma.
What causes the restricted diffusion?
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High cellularity.
MRI demonstrates a large mass appearing to arise from the vermis of the cerebellum. It has increased T2 and reduced T1 signal with heterogeneous enhancement. Moderate restricted diffusion is present.