• Benign fibro-osseous neoplasm. It is difficult to differentiate the calcified tissue within the lesion between bone and cementum.
• Most commonly in the third and forth decade.
• It is usually located in the premolar/molar area in the mandible.
• Three stages of development: radiolucent – mixed – radiopaque.
  • In early stage it appears as unilocular, well-defined radiolucency.
  • With time radiopaque foci develop within the lesion.
  • When radiopaque is usually surrounded by a thin radiolucent halo.
• Generally asymptomatic, unless they become large enough.
• It can cause displacement of the adjacent teeth. Root resorption is uncommon.