[Diagnostic and therapeutic endoscopy in ENT. Possibilities and limits].

Both flexible and rigid endoscopy have become very common in ENT in the last decade. This has led to an increase in the diagnostic and therapeutic spectrum, and, in particular, quality control. Because the purchasing price of optical systems, as well as their maintenance, can be quite expensive, the expected spectrum of applications should be taken into account in choosing endoscopic equipment. This review provides aid in choosing the right system without defining legally binding parameters.