19 Dentigerous Cyst

DEFINITION/OVERVIEW



  • Cyst formation arising from the soft tissues attached to the crown of an unerupted tooth

c19uf003ETIOLOGY/PATHOPHYSIOLOGY



  • Dogs/cats

    • Any breed which is at an increased risk for impaired eruption (see Chapter 15)

c19uf004SIGNALMENT/HISTORY



  • Boxers, bulldogs: mandibular first premolars—often bilateral
  • Unerupted teeth at 6–7 months of age, but cystic development may not occur until much later, if at all

c19uf005CLINICAL FEATURES


Dogs



  • Cystic changes may be clinically inapparent without diagnostic imaging
  • “Missing” tooth
  • Formation of a nonpainful, soft swelling at the site of a missing tooth, often fluctuant with fluid (Fig. 19-1)
  • Radiographically: radiolucent unilocular (single-compartment) cyst originating from the remnant enamel organ at the neck of the tooth and encompassing the crown (Fig. 19-2)

    • Unerupted teeth are commonly seen to be oriented horizontally

  • Patient may present, with no previous indications, for a pathological fracture of the mandible due to cystic expansion and secondary resorption of surrounding bone


x25AA001rs Figure 19-1 Soft fluctuant swelling behind the right mandibular canine.


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May 22, 2017 | Posted by in GENERAL | Comments Off on 19 Dentigerous Cyst

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