Endoscope inserted through nose to access skull base chordoma

Endoscopic skull base surgery uses a long, thin tube called an endoscope to access the base of the skull. The endoscope goes through the nose. A surgeon puts tools through the endoscope to do the surgery. This illustration shows an endoscope going through the nose to treat a chordoma, which is a type of bone cancer that often happens at the base of the skull.