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Gliolan is an oral dye which is taken up preferentially by tumor. Under a special light, it glows, so that the surgeon can tell the difference between tumor and normal brain at the time of surgery. This allows for a more complete resection and less harm to the normal brain. This paper compares the use of Gliolan to the use of intra-operative MRI. They found that the chance of getting a complete resection is about the same - with a slight but not significant edge to the MRI, but a whopping decrease in the time of surgery by about 100 minutes using Gliolan instead of the intraoperative MRI..