= rare benign periapical lesion

Origin: true neoplasm of cementum

Prevalence:<1% of all odontogenic tumors

Age:<20 years (50%); <30 years (75%)

Associated with: erupted permanent tooth (common); near impacted / unerupted tooth (rare)

Location: mandible (>75%): 90% molar / premolar region

Site: fusion with root of tooth(s); invasion of root canal / pulp chamber (occasionally)

• periapical sclerotic sharply marginated round opaque sunburst lesion
• surrounded by thin halo of low attenuation

Rx: complete removal of tooth to avoid recurrence

DDx: condensing osteitis (periodontal ligament space not obscured)