Panoramic radioghraph (OPG)
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Well defined lytic lesion at the angle of the mandible on the right. It contains an unerupted tooth.
Features favour a dentigerous cyst.
Dentigerous cysts are slow growing benign and non-inflammatory odontogenic cysts that are thought to be developmental in origin.
On imaging, they usually present as a well-defined and unilocular radiolucency surrounding the crown of an unerupted or impacted tooth within the mandible.
When small, it is difficult to differentiate a dentigerous cyst from a large but normal dental follicle. When larger, the differential is essential that of lytic lesions of the jaw and includes:
- periapical cyst (radicular cyst)
- aneurysmal bone cyst (ABC)
- keratocystic odontic tumour (odontogenic keratocyst)
- cherubism (fibrous dysplasia)
- Stafne cyst