Skull base surgery is a surgery that is done to remove a tumor or other growth at the base, or bottom, of the skull. It is necessary in case of a brain tumor near the pituitary gland, tumors in the pituitary gland, tumors of the sinuses and nasal cavities. Mass of tissue within a skull base caused by abnormal cell grows and multiply uncontrollably than normal cells. Diagnosis will likely be a CT scan, MRI scan, etc. Minimally invasive skull base surgery also called endoscopic skull base surgery, is a surgical technique that lets doctors do this delicate surgery through the nose. Skull base surgery is carried out by neurosurgeon.