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Dentigerous cysts are benign odontogenic cysts that are associated with the crowns of permanent teeth. Dentigerous cysts surrounding impacted teeth often displace teeth into ectopic positions. In the maxilla, these teeth are often displaced into the maxillary sinus. We report 3 cases of dentigerous cysts associated with an ectopic tooth in the maxillary sinus and review the literature reports of this condition over the past 29 years.