Abstract
Management of residual cyst by marsupialization, decompression, surgical endodontic therapy, is reported here. Though typically surgical enucleation is the recommended treatment for small cystic lesions, Treatment of large lesions may require a treatment plan that is delivered through two stages: first stage is marsupialzation and decompression. Second stage is surgical endodontic treatment accompanied by curettage and surgical enucleation. A case report is presented of a massive residual dental cyst. Presentation, diagnosis and management of the massive cyst are discussed.