Archives

Odontogenic keratocysts can occur at any age with a peak incidence within the second and third decades and are found in the mandible in approximately a 2:1 ratio. Radiographically an unerupted tooth is involved in the lesion in 25% to 40% of cases. Here is a case report of a 13 year old girl with a retained carious primary second molar and an impacted premolar with a dilacerated root. There was a well circumscribed radiolucent lesion between the root of the deciduous tooth and the crown of the impacted permanent tooth, leading to a provisional diagnosis of a radicular cyst or a dentigerous cyst. However, upon histopathological examination, it turned out to be an odontogenic keratocyst. Although OKC is known to present like dentigerous cyst, its association with an impacted mandibular premolar is very rare, and the presentation in a periapical region of carious deciduous molar is even more uncommon.

Odontogenic keratocyst, Radicular cyst, Deciduous tooth, Mandibular cysts, Impacted mandibular premolar