A rare case of the periosteal benign osteoblastoma arising from the mandible in a 45-year-old female was reported. This case had been followed up during 7 years duration from the first to the time of diagnosis, because the patient had been treated by the root canal of the 7 at this period. The radiographic findings revealed the advancement in calcification with a radiative pattern and resulted in a well-defined radiopaque area with extent of the lesion. The cases reported in literature were also reviewed.
