Recently, the prevalence of mycosis of the maxillary sinus has increased. However maxillary sinus mucormycosis is relatively rare. We encountered a case of maxillary sinus mucormycosis in a 45-year-old man whose chief complaint was pain in the left infraorbital region and the upper molar region. This patient had foul-smelling rhinorroea, and a radiograph showed diffuse radioopacity in the left maxillary sinus. The clinical diagnosis was odontogenic maxillary sinusitis. Lavage of sinus was performed, and antibiotics were given, but there was no response. Therefore, radical surgery of the maxillary sinus was performed, and fungal masses were noted in the maxillary sinus. Although bacteriological studies were not performed in this case, histological examination verified that the fungus belonged to the order Mucorales. The postoperative course was uneventful, and there have been no signs of recurrence as of 1 and a half years after operation.
