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
1. 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
1. Mandibular cysts – may be expansile
2. 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 2

p>Residual Cyst
Example 3

Residual Cyst
Example 3

Residual Cyst- Example 1

Residual Cyst- Example 2

Residual Cyst - Example 3

Residual Cyst - Example 1

Residual Cyst(outlined in red arrows) located in the maxillary anterior region in an edentulous site.

Residual Cyst - Example 1

Residual Cyst(outlined in red arrows) located in the maxillary anterior region in an edentulous site. Coronal view shows the cyst adjacent to the nasopalatine canal

Residual Cyst - Example 2

Residual Cyst(outlined in red arrows) located in the mandibular right premolar region in an edentulous site.

Residual Cyst - Example 2

Residual Cyst(outlined in red arrows) located in the mandibular right premolar region in an edentulous site.

Residual Cyst - Example 3

Residual Cyst(outlined in red arrows) located in the mandibular left lateral incisor region in an edentulous site.

Residual Cyst - Example 3

Residual Cyst(outlined in red arrows)located in the maxillary anterior region in an edentulous site. Axial view shows the cyst adjacent to the nasopalatine canal

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Residual Cyst

Author :

Residual Cyst

Radiographic Features

Effect on surrounding structures:

Differential diagnosis