The occurrence of dentigerous cysts in maxillary sinus are uncommon. Dentigerous cysts are developmental odontogenic cyst which originate by the separation of the follicle form around the crown of an impacted or unerupted tooth. The dentigerous cyst appear as oval well defined unilocular radiolucency with sclerotic border radiographically. OPG and NCCT scan are important tools in the diagnosis of dentigerous cysts located in the maxillary sinus. Our prime aim was to report the treatment of dentigerous cyst in maxillary sinus associated with 3rd molar with a complain of painful swelling over her right cheek with intraoral pus discharge in 21 year old girl by Caldwell-Luc Approach. Histopathological examination report of the specimen, confirmed the diagnosis.
Key words: Dentigerous cyst, ectopic 3rd molar , Caldwell-Luc approach, maxillary sinus, case report.