Odontogenic keratocyst (OKC), also known as keratocystic odontogenic tumor (KCOT), is an emerging odontogenic tumor originating from the dental lamina. It is an aggressive lesion with a squamous epithelium and a recurrence rate of 15-35%.1 Radiologically, there is a clear, smooth, or shell-like border showing a unilocular or multifocal, polycystic radiographic picture. Hard tissue formation in OKC is a very rare phenomenon and occurs in the form of dystrophic calcification, cartilaginous tissue or dentinoid.2 In this article, we report the case of OKC with calcification. OKC with radiopaque lesion is very rare, these are considered as dystrophic calcification, dentinoid formation, ossification. The incidence of dystrophic calcification in recurrent OKC is low, so it can be inferred that the recurrence rate of OKC with dystrophic calcification is lower than that of conventional OKC.

• 박시연(부산대학교 치의학전문대학원 구강악안면외과학 교실) | Si-Yeon Park (Dept. of Oral and Maxillofacial Surgery, School of Dentistry, Pusan National University)
• 김욱규(부산대학교 치의학전문대학원 구강악안면외과학 교실) | Uk-Kyu Kim (Dept. of Oral and Maxillofacial Surgery, School of Dentistry, Pusan National University)
• 유미현(부산대학교 치의학전문대학원 구강병리학 교실/BK21 플러스 사업단) | Mi Heon Ryu (Department of Oral Pathology/BK21 Plus project, School of Dentistry, Pusan National University)
• 정연화(부산대학교 치의학전문대학원 영상치의학과 교실) | Yun-Hoa Jung (Department of Oral and Maxillofacial Radiology, School of Dentistry, Pusan National University)
• 황대석(부산대학교 치의학전문대학원 구강악안면외과학 교실) | Dae-Seok Hwang (Dept. of Oral and Maxillofacial Surgery, School of Dentistry, Pusan National University) Correspondence