Science and Education Publishing International Journal of Dental Science and Research 1 3 2013 12 02 Dentigerous Cyst Associated With Maxillary 3rd Molar Involving Maxillary Sinus -A Rare Case Report 50 52 EN Nishant Kumar Venkatesh Jayaraman Department of Oral Medicine and Radiology, Rajah Muthiah Dental College and Hospital, Annamalai University, Chidambaram, India Ramasamy S IJDSR2013132 10.12691/ijdsr-1-3-2 2013 09 30 2013 11 14 2013 12 02 Dentigerous cyst is the most prevalent type of odontogenic cyst and is associated with crown of an unerupted or developing tooth, and accounts more than 24% of jaw cysts, usually develops around crown of mandibular third molar, maxillary canine, followed by mandibular premolars, but rarely involve supernumerary teeth and central incisors. Here, we present an interesting case of dentigerous cyst in a 20-year old female patient, which developed around an impacted maxillary 3rd molar. Histological examination revealed a cyst cystic lining made up of non-keratinized to focally parakeratinized stratified squamous epithelium and dense fibrous connective tissue wall. The epithelial lining was of variable in thickness and in focal areas showed variable dysplastic features.