JGMDS March 2017-September 2017 47 ODONTOGENIC KERATOCYST INVOLVING MAXILLARY SINUS: A CASE REPORT Jawad Ahmad Kundi 1 , Muhammad Ilyas 1 , Faryal Gul 1 , Salman Khan 1 , Syeda Shamal 1 , Fatima Mumtaz 1 1. Sardar Begum Dental College ABSTRACT Odontogenic Keratocyst (OKC) is a benign odontogenic cystic lesion which arises from dental lamina lined by parakeratinized stratified squamous epithelium. Odontogenic Keratocyst is (OKC) also termed as Keratocystic Odontogenic Tumour (KCOT) (WHO 2005). Most frequently it involves posterior of the mandible than maxilla. OKC in the maxillary sinus is rarely reported. The treatment approaches vary in case to case manner. However regular follow up for minimum of five years is required. KEYWORDS: Odontogenic keratocyst, Maxillary sinus, Enucleation. INTRODUCTION Odontogenic keratocyst (OKC) is a benign odontogenic cystic lesion lined by parakeratinized stratified squamous epithelium. Mostly occurs in the second and third decade of life having locally destructive characteristics with high recurrence rate, it demonstrates a high mitotic activity and epithelial turnover. 1, 2 Due to these neoplastic behavior WHO classified OKC as odontogenic keratocyst tumor in the WHO classification of head and neck tumors in 2005. 3 Most of the odontogenic keratocyst are associated with unerupted tooth unable to differentiate it from dentigerous cyst in the radiological examination. 4 CASE REPORT A 19 year-old-male patient reported to the department of Oral and Maxillofacial Surgery, Sardar Begum Dental College, Peshawar with history of pain and swelling in the left side of the face. The pain was dull and continuous and the swelling increases with time resulting in extra-oral swelling in the middle face region. Extra-oral examination showed facial asymmetry. Intra-oral examination revealed that the swelling was tender and obliterating the buccal sulcus. All teeth except third molar were present. Figure # 1: Obliteration of buccal sulcus Correspondence: Dr. Muhammad Ilyas Sardar Begum Dental College Contact: 0302-8809637 Email: ilyas_khan526@yahoo.com