hello my husband had a brain tumor removed in May 2011 . it was a cerebello pontine angle tumor. After a month it grew back bigger. he went and had cyberknife treatment in august 2011 after finished they said the tumor has shrunk 20 percent since. All the time his head has been swolled getting worse and worse . the cyberknife doctors said it was because the duct that drains the brain fluid to the spine is blocked and needs repair.this was happening before the cyberknife. well the nuerosurgeon said its from the cyberknife we dont understand this and dont know why . I was just wondering if you had any answers