fMRI has proved to be a reliable, safe, reproducible method with which to presurgically define eloquent areas. This technique gives us the opportunity to know in advance the actual situation of a lesion so that the surgeons may plan their approach strategy. This technique also allows the establishment of a presurgical evaluation of risk and enables the patient to be fully aware at the moment of informed consent. Despite the increase in its clinical applications, fMRI is still underused in the clinical field and should be performed almost routinely before surgery.
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