Hi, Thanks for writing in. Brain tumors are of many types and it is important to know which type of cancer is present as per CT scan or MRI scan done. The location and size of brain cancer is also important and helps to decide on treatment. It is easily approachable and the tumor can be operated then surgery is recommended followed by chemotherapy and radiation if required. Should the tumor be in an important area and involving the surrounding structures then radiation is the first choice of treatment. There are cancer that respond better to radiation and then chemotherapy can be given to stabilize the cancer. As your doctor has already told that the tumor cannot be operated up on therefore it is better to continue radiation treatment and not to take risk by doing surgery in the beginning. Please do not worry.