The present study has several limitations. Firstly, the results are based on a small series of 30 patients with diverse glioma grades and should therefore be considered preliminary. Secondly,
it was not possible to confirm whether the area measured by the imaging modalities corresponded exactly to the area showing the highest histological grade and/or the most aggressive cell cycle
features, especially in large heterogeneous tumours. Finally, due to the limited number of cases, in each tumour category, possible
prognostic information has not been investigated.