Abstract
Osseous and cartilaginous choristoma is a soft tissue mass containing normal-appearing bone and cartilage. We report an extremely rare case of osseous and cartilaginous choristoma in the maxillary gingiva. The patient was a 7-year-old boy who had been aware of a tumor in the maxillary gingiva since 3-years old. At presentation, the tumor was approximately 5 mm in diameter. We diagnosed an osteoma or benign tumor of the gingiva. The tumor was excised with the patient under general anesthesia. Histological examination of the excised specimen revealed that the tumor contained cartilaginous and osseous tissues. The histological diagnosis was an osseous and cartilaginous choristoma of the gingiva.
