Residual Cyst
Author :
Sindhura Anamali B.D.S., M.S.
Diplomate Of ABOMR , Clinical Assistant Professor, The University of Iowa
sindhura-anamali@uiowa.edu
Residual Cyst
- Is an odontogenic cyst
- Arises in an area where a cyst was incompletely removed
- The remnants of the incompletely removed cyst results in a residual cyst in the region
- The most common residual cyst is a residual radicular cyst
- Many cases are detected as incidental findings on routine radiographic procedures
- Asymptomatic
- If secondarily infected – pain and swelling can be present
- Maxilla > Mandible
Radiographic Features
- Well-defined radiolucent hydraulic entity with corticated borders, usually in an edentulous region
- Dystrophic calcifications are seen in long standing cysts
- Usually unilocular, but can get very large
- Mandibular cysts – may be expansile
- Maxillary cysts – cortex may be interrupted
Effect on surrounding structures:
- May cause displacement and resorption of adjacent teeth
- May cause displacement of the inferior alveolar canal and displace the floor of the maxillary sinus
Differential diagnosis
- Odontogenic Keratocyst
- Unicystic Ameloblastoma
Management
- Surgical removal of the cyst
- Large cysts can be treated by marsupialization
Residual Cyst
Example 1
Residual Cyst
Example 1
Residual Cyst
Example 2
Residual Cyst
Example 2
Residual Cyst
Example 3
Residual Cyst
Example 3