Radicular Cyst: Etiology: associated with the root of a nonvital tooth, caries, trauma (fracture or injury), or periodontal disease. Method of Transmission: N/A Characteristics: Found in any region of the mandible and maxilla, but mostly the maxillary anterior region at the apex of a nonvital tooth. Radiograph shows root resorption of the tooth. A pulp- testing device is used to as a diagnostic tool, however a biopsy is needed to confirm a radicular cyst. Identification can only be made through microscopic exams.. Dental Implications: Failure to remove the radicular cyst completely results in recurrence. Tx & Prognosis: removal by ext, surgery with curettage, RCT, apicoectomy, and antibiotic coverage. Prognosis is good with complete removal