At some time in their lives, 1 in 5 people will have a pituitary tumor, and 1 in 600 of these will have the tumor grow large enough (>1 cm in diameter) that surgical resection is required. Traditionally, surgery to remove pituitary tumors or other tumors at the skull base requires transcranial or transfacial access. In these approaches, large traumatic, often disfiguring, openings must be created in the patient's forehead or cheek. Endonasal skull base surgery reduces invasiveness resulting in less trauma, fewer complications, and shorter surgical time. However, despite the compelling advantages for the patient, only a small percentage of skull base surgeries are done endonasally. While exact statistics are not available, the current best estimate in the literature is that less than 50% and most likely less than 20% of these tumors are addressed by endonasal surgery.