After that, the laser treatment will be performed. At the same time, MRI scans will be taken during the procedure. The treatment will last between 5 and 10 minutes. After treatment, follow-up MRI scans will be taken, which may take 30-60 minutes longer. If any tumor tissue is left over, the laser may be moved slightly and a second treatment performed. Once completed, the needle will be removed, and your incision will be closed in the standard way.