Odontogenic keratocyst (OKC), also known as keratocystic odontogenic tumor, is a distinct clinicopathologic lesion that can be clearly identified by histologic examination. Clinically, OKC is characterized by a high recurrence rate. This report describes a rare case of OKC with mural calcification in the maxilla of a 47-year-old male patient. Orthopantomography and Cone Beam Computed Tomography showed full opacification with calcification and lateral wall resorption in the left maxillary sinus, destroying the sinus floor. Hard tissue deposits have rarely been reported in the connective tissue walls of OKC. The importance of calcified material formation to the biological behavior of OKCs is unclear. Although its prognostic value has not been studied, the presence of calcification materials does not appear to increase the risk of recurrence. Study of a number of samples would be needed to determine the nature of the correlation between the presence of calcified materials and recurrence.

• 양재영(부산대학교 치의학전문대학원 구강악안면외과학교실) | Jae-Young Yang (Department of Oral and Maxillofacial Surgery, School of Dentistry, Pusan National University)
• 유미현(구강병리학교실, BK21 Plus project, 치과생명과학연구소) | Mi-Heon Ryu (Department of Oral Pathology, BK21 Plus Project, and Dental and Life Science Institute, School of Dentistry, Pusan National University)
• 황재준(부산대학교 치의학전문대학원 구강악안면방사선학 교실) | Jae-Joon Hwang (Department of Oral and Maxillofacial Radiology, School of Dentistry, Pusan National University)
• 정연화(부산대학교 치의학전문대학원 구강악안면방사선학 교실) | Yun-Hoa Jung (Department of Oral and Maxillofacial Radiology, School of Dentistry, Pusan National University)
• 김욱규(부산대학교 치의학전문대학원 구강악안면외과학교실) | Uk-Kyu Kim (Department of Oral and Maxillofacial Surgery, School of Dentistry, Pusan National University)
• 황대석(부산대학교 치의학전문대학원 구강악안면외과학교실) | Dae-Seok Hwang (Department of Oral and Maxillofacial Surgery, School of Dentistry, Pusan National University) Correspondence