A unilateral Dentigerous cyst associated with impacted mandibular canine crossing the midline: a rare case report

Introduction: A dentigerous cyst is the most common developmental odontogenic cyst and is frequently noted as an incidental finding on radiographs. The most common teeth affected are impacted mandibular third molars and permanent maxillary canines. This case involves a dentigerous cyst encompassing the right impacted mandibular canine and crossing the midline. This is a rare case of dentigerous cyst encompassing non-adjacent teeth and crossing the midline reported in recent literature. Case presentation: The patient presented to our department of oral and maxillofacial surgery for treatment of swelling in the lower chin area. The patient was a 10-year old girl with a dentigerous cyst extending from right to left mandibular canines and crossing the midline with the right mandibular canine being impacted. Conclusion: This case involves an unusual clinical and radiographic presentation of a dentigerous cyst crossing midline. It shows a new variant of presentation that dentists, especially maxillofacial surgeons, paedodontists and radiologists, should be aware of, since a dentigerous cyst crossing the midline is rare.