Classification
Radicular Cyst (Periapical Cyst)
Cyst at the apex of a non-vital tooth, attached to the root.
- • Tooth still present
- • Cyst attached to root apex
- • Non-vital tooth (negative cold/EPT test)
- • Periapical radiolucency on X-ray
Residual Cyst
Persists after extraction of the offending tooth.
- • Tooth has been extracted
- • Edentulous site with radiolucency
- • Cyst not removed at time of extraction
- • May grow undetected for years
Lateral Radicular Cyst
Cyst forms lateral to the root through a lateral root canal.
- • Radiolucency on lateral root surface
- • Tooth present and non-vital
- • Associated with lateral accessory canal
- • Less common variant