Summary of literature assessing the ADC values of paediatric posterior fossa tumours. Vertical bars show the range of ADC values for each tumour type from various studies, horizontal lines illustrate the ADC threshold for identifying medulloblastoma from pilocytic astrocytoma and ependymoma, and the number above each vertical bar state how many tumours are included in the range. The weighted mean ± one standard deviation for combined results each tumour type is shown as the final vertical bar for each tumour type.