Malignant tumor of the paranasal sinus is a rare, occurring most frequently in the maxillary sinus. Carcinomas of the maxillary sinus are usually diagnosed at the advanced stage because most tumors have no symptom or nonspecific symptoms such as pain, nasal obstruction, rhinorrhea, and epistaxis. In addition to these features, it is difficult to distinguish carcinoma from inflammatory or cystic lesion on imaging study until the carcinoma destroys the surrounding structures. Therefore, the diagnosis is prone to be delayed. Here, we report a case of an 83‐year‐old male with nonkeratinizing carcinoma on the maxillary sinus, which was initially misdiagnosed as a cystic lesion. The aim of this study is to emphasize the effort for early diagnosis in order to improve prognosis and avoid inadequate treatment

• 박정현(연세대학교 치과대학 구강악안면외과학교실) | Jung Hyun Park
• 최은주(연세대학교 치과대학 구강악안면외과학교실) | Eun Joo Choi
• 박혁(구강악안면방사선학교실) | Hyok Park
• 김현실(구강병리학교실, 구강종양연구소) | Hyun Sil Kim correspondence