Learning Center

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 1

Residual Cyst
Example 2

Residual Cyst
Example 2

Residual Cyst
Example 3

Residual Cyst
Example 3

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