A case of a large dentigerous cyst associated with an impacted supernumerary tooth in the central maxilla

We describe a large dentigerous cyst arising from an inverted and impacted maxillary central supernumerary tooth in an adult patient. The patient was a 60-year-old man who consulted our department for the detailed examination of a large radiolucent region in the maxilla. This finding had been observed on a panoramic radiograph recorded during a visit to his local dental clinic. Computed tomography revealed an inverted and impacted maxillary central supernumerary tooth and a unilocular radiolucent region measuring approximately 50 × 34 × 36 mm, which encompassed the tooth crown within the lumen. After a biopsy and the diagnosis of a dentigerous cyst, the patient underwent cystectomy and extraction of the supernumerary tooth under general anesthesia. The histopathological diagnosis was a dentigerous cyst. As of 2 years 6 months after surgery, the patient has been progressing well, with no signs of recurrence.