1. Aldana PR, Naseri I, La Corte E (2012) The naso-axial line: a new method of accurately predicting the inferior limit of the endoscopic endonasal approach to the craniocervical junction. Neurosurgery 71(Suppl 2):ons308–ons314
2. Baird CJ, Conway JE, Sciubba DM, Prevedello DM, Quiñones-Hinojosa A, Kassam AB (2009) Radiographic and anatomic basis of endoscopic anterior craniocervical decompression: a comparison of endonasal, transoral, and transcervical approaches. Neurosurgery 65(6 Suppl):158–163
3. Balasingam V, Anderson GJ, Gross ND, Cheng CM, Noguchi A, Dogan A, McMenomey SO, Delashaw JB Jr, Anderson PE (2006) Anatomical analysis of transoral surgical approaches to the clivus. J Neurosurg 105:301–308
4. Carrau RL, Prevedello DM, de Lara D, Durmus K, Ozer E (2013) Combined transoral robotic surgery and endoscopic endonasal approach for the resection of extensive malignancies of the skull base. Head Neck 35(11):E351–E358
5. Crockard HA (1985) The transoral approach to the base of the brain and upper cervical cord. Ann R Coll Surg Engl 67:321–325