Abstract
A 57-year-old man was referred to our clinic in December 2008 because of painless gingival swelling at the anterior mandibular region. Intraoral examination revealed a defined bony mass with expansion of the labial cortex. Panoramic radiography showed a well-circumscribed, multilocular radiolucent lesion located between the right lateral incisor and the left canine, with displacement of the left incisors of the mandible. Computed tomography indicated expansion and thinning of the labial cortical bone adjacent to the multilocular lesion, with perforation of the cortex. Under general anesthesia, the tumor-like lesion was easily enucleated, and the surface of the bony wound was shaved. The lesion was diagnosed to be a glandular odontogenic cyst （GOC） histopathologically. There has been no sign of recurrence for 1 year postoperatively.
