Actinomycosis imitating nasopharyngeal carcinoma

The incidence of nasopharyngeal actinomycosis is exceedingly rare. To our k nowledge, only 1 case has been reported previously. This article presents 4 cases of actinomycosis involving the nasopharynx that imitated nasopharyng eal carcinoma. Acidic gas exposure and farming of aquatic products are poss ibly involved in the pathogenesis of nasopharyngeal actinomycosis. Patients in the case studies completely recovered after 4 weeks of oral antibiotic treatment. We recommend including actinomycosis in the differential diagnos is of nasopharyngeal neoplasms.