A 42-year-old man was referred to the Department of Oral and Maxillofacial Surgery, Seoul National University Dental Hospital, for treatment of a cyst in the anterior mandible that was found at a local dental clinic. Cone-beam computed tomography revealed a radiolucent lesion with a diameter of > 2 cm and a labial cortical bone perforation in the lower anterior region, and the cyst was in contact with two fixed metal plates. The patient stated that he had undergone orthognathic surgery and genioplasty at another hospital 24 years earlier. The patient had no medical history except for smoking half a pack a day, and he did not complain of any other symptoms such as pain or paresthesia in the affected area. While the patient was under general anesthesia, the cyst was enucleated. A full-thickness alveolar mucosal flap was constructed via an incision in the anterior part of the mandible. The anterior part of the cyst was attached to the periosteum and was dissected and enucleated. After resection of the soft tissue remaining on the cyst wall, a specimen was sent to the Department of Oral Pathology for definite diagnosis. Two four-hole plates and eight screws were removed. Primary sutures with absorbable, and nonabsorbable suture thread were placed. Histopathological examination revealed that the cyst was lined inside with ciliated respiratory epithelium, and a surgical ciliated cyst was diagnosed. No recurrence was observed on panoramic radiographs 7 months after the surgery.