Gastrointestinal stromal tumours: correlation of modified NIH risk stratification with diffusion-weighted MR imaging as an imaging biomarker.

•Except size and necrosis, conventional MR findings of GISTs were not significantly different according to the modified NIH criteria.•The ADC values of GISTs were negatively correlated with the modified NIH criteria.•The ADC value can be helpful for the determination of intermediate or high-risk GISTs.