Iatrogenic rhinopharyngeal isolated argyria induced by silver-containing nasal drug.

: Localized nasal argyria has been reported in 3 published articles as secondary to occupational exposure and involving the anterior part of the nose. No previous cases of such pathology involving the rhinopharynx were described. Here we report the first case of localized argyria of the roof and of the posterior wall of the rhinopharynx secondary to prolonged use of nasal drops containing colloidal silver protein. The recognition of such pathology can be useful to increase the number of conditions that must be considered in the differential diagnosis of rhinopharyngeal mucosa alterations.