There are many reports which mentioned about the benefit of image-guided navigation system for the surgery of head and neck region. The wider the system become used, the more problems were raised ex; The indication of the system, or how accurate should it be. In this study, we report our experiments of the system, the estimates of the surgeon who used this system, the indication of the system, and the risk of the system. We found that the navigation system was very useful for the ENT surgery especially if the case was anatomically difficult.
