FIGURE 2.

Illustration of foam application to the olfactory cleft using the provided syringe in a back‐to‐front fashion in order to also affect retronasal olfactory abilities. (Small picture) Endonasal view after foam application with a 25‐degree‐angle rigid endoscope. The inferior meatus remains free of foam. This particular subject's odor‐threshold testing score dropped from 6.25 to 1.5, but there was no change in the retronasal test score. The investigator recorded a difficult rear approach due to a septal spur. PNIF improved by 20 points following decongestion and foam application. PNIF = peak nasal inspiratory flow.