[A painful periapical radiopacity in the lower jaw].

A periapical radiopacity is frequently encountered by chance on a conventional periapical or panoramic x-ray. However, local pain and/or swelling in the area of a radiopacity is seldom seen. Here, we report on 2 cases of patients referred to the oral and maxillofacial surgeon with a painful periapical radiopacity in the lower jaw. The clinically and radiologically assumed diagnosis was a cementoblastoma, which was confirmed by histopathological examination following its surgical removal. A cementoblastoma is a rare, benign odontogenic tumor, mostly found in patients younger than 30. Treatment consists of surgical removal of the tumor, almost always together with the attached tooth. The recurrence rate after complete removal is approximately 12%. A cementoblastoma is clinically distinguished from other periapical radiopacities by local pain and sometimes swelling and radiologically by a relationship with the roots of a (pre)molar, a radiolucent rim surrounding the opacity, bone and/or root resorption and expansive growth.