A case of the face gas gangrene complicated by terminal breast cancer is reported. The patient was a 61-year-old woman who referred to our hospital by a dental clinic because of remarkable swelling of the right side of the face. The clinical symptoms and CT findings were consistent with a diagnosis of non-clostridium gas gangrene. We treated the patient with extensive surgical debridement and administration of appropriate antibiotics. These treatments were effective and successful, and she recovered from severe infection. We initially suspected this case to be gas gangrene caused by odontogenic infection, but the extracted molar was not in such bad condition that it could have caused inflammation. We thought that the gas gangrene developed from a lesion of the buccal mucosa.
