Abstract
A case of a palatal tumorous lesion was found in a 2 years and 3 months old Japanese boy. Histopathologically, it was diagnosed as the odontogenic hamartomatous lesion of the palate. It occurs very rarely in the oral region.The findings were as follows ;Intraoral examination showed a gingival-colored mass with a smooth surface, measuring 8×4×3 mm on the palatal mucosa adjacent to the left upper central primary incisor.Radiographic examination revealed a small calcified mass in the left upper central primary incisor region, which was almost the same place as the base of the palatal tumorous lesion. Impacted supernumerary tooth was found between the upper central primary incisor regions.Histopathologically, the myxoid mesenchymal tissue was increasing in the tumor-like lesion area and it included cord-like or a little of an odontgenic epithelium component. Furthermore, the enamel matrix component and the dysplastic dentin were found.Also, the small calcified mass in the tumorous lesion had enamel, dentin, cementium and pulp tissue, so that it was thought to be derived from the dental hard tissue. It had probably developed as same as the impacted supernumerary tooth.We concluded that this tumorous lesion was an odontogenic hamartomatous lesion and it was made because of the existance of the small calcified mass, but that the impacted supernumerary tooth was not related to the tumorous lesion.The tumorous lesion including the calcified mass was completely removed under general anesthesia, and the impacted supernumerary tooth was extracted. Postoperative course was good, and there was no recurrence after 9 months follow-up.
