You usually need a biopsy to find out the type of brain tumour you have. A biopsy is when the surgeon removes a small piece of the tumour to be examined by an expert doctor in cell types (pathologist). They can then name the type of tumour you have. Sometimes you have a biopsy during the operation to remove the tumour.
Usually you only need to stay in hospital for a few days. You will have a brain MRI scan or CT brain scan first to find the exact position of the tumour. During the biopsy, the surgeon makes a small hole in your skull. They pass a fine needle through this to remove a small piece of the tumour.