HighlightsDentigerous cysts are commonly single lesions. Bilateral and multiple dentigerous cysts are very rare.Ectopic tooth eruption outside the oral cavity is a rare entity.The endonasal endoscopic approach has the advantages of avoiding external mucosal incision, oroantral fistula formation and recurrent sinusitis.

This article presents a rare case report of an ectopic third molar tooth located in the medial wall of maxillary sinus in a young male manifesting as recurrent sinusitis along with upper jaw pain and postnasal discharge diagnosed with an ectopic tooth and bilateral dentigerous cysts. This article aims to discuss this rare presentation of an ectopic tooth as a cause of recurrent maxillary sinusitis and the endonasal endoscopic management of the case.

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