This 30-years old patient had pain in the right lower jaw. He had been treated earlier for caries. An OPG showed an osteolytic lesion and the patient came for a dental CT, which showed a well-defined, odontogenic lesion, with its epicentre in relation to the root of the first molar tooth, but extending from the second premolar to the second molar (Figs. 1-4).
This appearance is highly suggestive of a dental cyst, also called a radicular or apical or periapical cyst. It occurs as a result of root infection.