Chapter 15 Odontogenic Cysts and TUmors Flashcards
What is the definition of an odontogenic cyst?
-Pathologic cavity lined by odontogenic epithelium and filled with fluid
What is a cyst that originates by separation of the follicle from around the crown of an unerupted tooth?
-Dentigerous Cyst
What is the most common developmental cyst?
-Dentigerous cyst
What is the definition of a dentigerous cyst?
-A cyst that originates by separation of the follicle from around the crown of an unerupted tooth
A dentigerous cyst encloses the crown of the unerupted tooth and is attached at what?
-The CEJ
What tooth do dentigerous cysts most commonly involve?
-Mandibular 3rd Molars
What is the size of a dentigerous cyst?
Over 3 mm
Are dentigerous cysts symptomatic or asymptomatic?
-Asymptomatic
Why must dentigerous cysts be removed?
-They can expand bone and cause facial asymmetry
T/F Dentigerous cysts often involve unerupted deciduous teeth
False
-Rarely involve
What is the treatment of a dentigerous cyst?
-Enucleation of the cyst together with the unerupted tooth
What is the soft tissue analogue of the dentigerous cyst?
-Eruption cyst
What does an eruption cyst develop as a reulst of?
-Separation of the dental follicle from around the crown of an erupting tooth
Who do you usually see eruption cysts in?
-Children younger than 10
What are eruption cyst also called?
-Eruption hematomas
What is the treatment for an eruption cyst?
-Cyst usually ruptures spontaneously or excise the roof of the cyst
What are the two most important things about an odontogenic keratocyst?
- 30 % recurrence rate
- Associated with a syndrome
Where do odontogenic keratocysts arise from?
-Cell rests of the dental lamina
The WHO has reclassified an odontogenic keratocyst as what?
-Keratocystic odontogenic tumor
What ages are most cases of Keratocystic odontogenic tumors diagnosed?
-Between 10-40
What is the most common location of a keratocystic odontogenic tumor (Odontogenic keratocyst)?
-Posterior mandible
How do Keratocystic odontogenic tumors tend to grow?
-Anterior-posterior direction
T/F Odontogenic keratocyst cause bone expansion.
False
-They do not cause bone expansion
Smaller odontogenic keratocyst are unilocular or multilocular?
-Unilocular
Larger odontogenic keratocyst are unilocular or multilocular?
-Multilocular
How are most odontogenic keratocysts treated?
- Enucleation
- Curettage
An unerupted tooth is involved in how many cases?
1/3
In an odontogenic keratocyst the epithelial lining is uniform and how many layers thick?
6-8 layers
T/F Odontogenic keratocysts may have small satellite cysts away from primary lesion termed daughter cysts
True
What does the pathology of odontogenic keratocysts have?
Thin friable wall
- Epithelial lining 6-8 layers thick
- Basal cell that palisades and is hyperchromatic
- Epithelium is surfaced by wavy Parakeratin
What is the reason the recurrence rate of odontogenic keratocysts are 30%?
- Thin walls
- Daughter cysts
- Friable
What is the other name for Nevoid basal cell carcinoma syndrome?
-Gorlin syndrome
What chromosome is Gorlin syndrome associated with?
-Chromosome 9
T/F Gorlin syndrome is AD inherited
True
What gene on chromosome 9 is Gorlin syndrome associated with?
-PTCH
What characterizes Gorlin syndrome?
- Multiple basal cell carcinomas
- Odontogenic keratocysts
- Calcification of the falx cerebri
- Rib anomalies
What is one of the most constant features of Gorlin syndrome?
-Odontogenic keratocysts
What is an odontogenic cysts with orthokeratinized lining and no basal palisading?
-Orthokeratinized Odontogenic Cyst
Where do Orthokeratinized Odontogenic cyst occur most commonly??
-Posterior mandible
T/F Orthokeratinized odontogenic cysts recur often
False
-They rarely recur
What represents the soft tissue counterpart of the lateral periodontal cysts?
-Gingival cyst of the adult
What is the Gingival cyst of the adult derived from?
-Rests of dental lamina (Rests of serres)
Where do gingival cysts of the adult typically occur?
-Mandibular canine and premolar area
What is the treatment for a gingival cyst of the adult?
-Surgical excision
What is a developmental odontogenic cyst which typically occurs along the lateral root surface?
-Lateral periodontal cyst
What is the bony counterpart of a gingival cyst of the adult?
-Lateral periodontal cyst
Where does a lateral periodontal cyst arise from?
-Dental lamina
“grape like”
-Lateral periodontal cyst
