The mandibular expanding lesion is benign in appearance.

The ossification and bone matrix formation as well as its expansion make cemento-ossifying fibroma the most likely diagnosis.

Mandibular fibrous dysplasia can also be considered in the differential diagnosis.

These are uncommon tumors, usually presenting in the 20-40 years age group, more commonly seen in women. Symptoms are usually associated with bone expansion.

They may also occur in the maxilla and elsewhere in the head and neck region.