Abstract
The combination of a complex "organ site" head and neck with a demand of a high accuracy and the difficulties with investigator depended examinations are easy to understand. Measurements of precision and deviations in tumour description and treatment decision of the investigator depended panendoscopy were never performed.
Therefore a simulation system as described is mandatory as neither ethical nor technical limitation allow this investigation in real clinical situations. As side effect a training system is developed, which allows training of procedures in critical situations.