MR Perfusion Methods in Patients With Suspected Recurrent High Grade Gliomas

"MR perfusion imaging will be performed in addition to the routine neuronavigational sequence obtained from re-operative/therapy planning.~Following MR examination, patient may undergo a surgical biopsy or excision as determined clinically by the neurosurgeon.~All patients, including those who do not go to surgery, will undergo clinical follow-up and imaging follow-up with perfusion imaging. This will allow for assessment of lesion progression over time, yielding valuable diagnostic information in differentiating radiation necrosis from tumour recurrence, particularly in those patients who do not undergo surgery."