The role of cone-beam computed tomography in evaluation of an extensive radicular cyst of the maxilla

Radicular cyst is the second most common odontogenic cyst. Most of these lesions involve the apex of offending tooth and appear as well-defined radiolucencies. When asymptomatic, a cyst can acquire a large size, even extending into anatomic cavities. The present case reports an extensive radicular cyst extending into the maxillary sinus that could have been easily mistaken for just a displaced tooth. Conventional radiographs show two-dimensional images of three-dimensional objects. Cone-beam computed tomography provides undistorted three-dimensional information of hard tissues, gives adequate spatial resolution, and recently seen as an expansion in diagnosis and management of periapical lesions. Prompt diagnosis and treatment of radicular cyst were successful with endodontic treatment and surgical management.