• Peng Yang, Hao Liang, Bo Zou, Jianlin Liu, Daoying Yuan, Zhen Meng, and Kai Xu.
• Department of Stomatology.
• Medicine (Baltimore). 2021 May 7; 100 (18): e25514e25514.

RationaleEctopic tooth is tooth erupting out of normal anatomical position. Ectopic tooth can occur in different positions, such as maxillary sinus and nasal cavity. In this article, we present a rare case of an ectopic tooth with a dentigerous cyst in the maxillary sinus compressing the nasolacrimal canal.Patient ConcernsAn 8-year-old girl presented with a 2-month history of spontaneous lacrimation in her right eye. When she wept, more tear shed from her right eye than that from the left one. Computed tomographic (CT) imaging showed a huge low-density image containing a tooth in the maxillary sinus in her right maxilla; the right nasolacrimal canal vanished due to the compression of the ectopic tooth.DiagnosesEctopic tooth with dentigerous cyst of right maxilla, and obstruction of nasolacrimal duct.InterventionsThe patient underwent nasal endoscopic maxillary sinus cystectomy.OutcomesThe patient recovered well after cystectomy and has been symptom-free.LessonsThe unique finding is that this is the first report about ectopic tooth compressing the nasolacrimal canal and inducing spontaneous lacrimation. Treatment: aspect: surgery under endoscope is a minimally invasive approach to ectopic tooth.Copyright © 2021 the Author(s). Published by Wolters Kluwer Health, Inc.

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