Dentigerous cyst of inflammatory origin: a case report

To document a case of a dentigerous cyst of inflammatory origin which developed due to periapical infection from a grossly carious deciduous tooth. An 11-year-old male patient presented with a 4-month history of swelling within the right mandible. Radiological examination showed a cystic lesion in association with an impacted, displaced tooth 44 with an overlying carious 85. Marked expansion of the buccal bone was noted.