The most common of the supernumerary teeth in humans are mesiodentes, which arise in the midline of the maxilla between the central incisors. The most common pathologic findings associated with a mesiodens are retention of the adjacent incisors, malposition, and diastema. The development of a dentigerous cyst in association with an impacted mesiodens is relatively uncommon. We report the case of a 35-year-old man with an extensive dentigerous cyst associated with a mesiodens who presented with a painful swelling in the left nasolabial area. We discuss the imaging findings in this case, particularly the contribution of computed tomography, and we review the literature on this interesting condition.
A dentigerous cyst is the most common type of developmental odontogenic cyst.1 It develops as a result of an insufficient amount of enamel epithelium in an impacted permanent tooth.1 Approximately 95% of all dentigerous cysts involve the permanent dentition, while the other 5% are associated with supernumerary teeth.1