this tumor. that's when the discussion takes place. the type of tumor is a be tumor typically found on the outer part of the brain pushing in to the brain as opposed to growing within the substance of the brain itself. you may ask why operate then. what's the reason to operate? mary tyler moore is 74. usually comings down to a combination of reasons or at least one com pepelling reason. one is that it does tastart to grow more quickly. two is that the tumor changes somehow. it's been looking benign, but now looks more made wlig nant. and third is that it's starting to cause problems or symptoms. blurriness of vision, numbness or weakness, headaches. so if these symptoms start to appear and they're related to