Pericoronal radiolucency associated with incomplete crown
A 12-year-old female patient was referred from a private dental clinic for the evaluation of a cystic lesion at the left mandibular ramus region. On clinical examination, there was a moderately painful swelling of the left mandibular angle area. The pain had started 2 weeks earlier, and mouth opening was limited. A panoramic radiograph revealed a large well-defined round unilocular radiolucency surrounding the developing crown of the lower left third molar, which was displaced upward to the sigmoid notch. The cemento-enamel junction of the involved tooth was incomplete (). The CBCT images showed a bucco-lingually expanded cortical plate associated with the lesion that surrounded the underdeveloped crown of the left lower third molar. The mandibular canal was identified inferior and lingual to the lesion (). A provisional diagnosis of odontogenic keratocyst was made, and the lesion was excised with the extraction of the involved tooth. The histopathological diagnosis proved to be an odontogenic keratocyst.