CON: laryngeal masks must not be used for surgery in the prone position.

First, do no harm! For our profession, this means that our most important concern must be patient safety. In a world with limited resources, the quest for safety is in constant conflict with the demand for efficiency. Ultimately, it is a trade-off of production pressure against safety. This conflict has a distinct problem: whereas production can be measured quite easily, safety only becomes visible in its absence.