Navigational systems in rhinology: should we all be using them?

The proximity of the paranasal sinuses to important anatomical structures creates the potential for serious complications following endoscopic sinus surgery. Over recent years, navigational systems have been developed and are increasingly being used by some centres. We summarise the history and principles of navigational sinus surgery, review the medical literature on the topic, and try to assess what role navigational systems should play in modern day rhinology practice.