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(A) shows how to use a nasal spray so as to avoid the septum and spray as much of the lateral wall mucosa as possible, allowing subsequent mucociliary clearance to distribute the liquid all over the mucosa. (B) shows how nasal drops (superior for rhinosinusitis) should be used with the head completely upside down so that drops reach the ostiomeatal complex in the upper nose where sinuses drain and ventilate (adapted from Scadding et al [1] (with permission)).
