Odontogenic cysts and tumors Flashcards
What is considered normal measurements in a dentigerous cyst?
-3 mm
What is the definition of an odontogenic cyst?
-Pathologic cavity lined by odontogenic epithelium and filled with fluid
Differentials of odontogenic cysts include what?
- Dentigerous cyst
- Odontogenic keratocyst
- Orthokeratinized odontogenic cyst
- Calcifying odontogenic cyst
Differentials of odontogenic tumors from odontogenic epithelial origin?
- Adenomatoid odontogenic tumor
- Calcifying epithelial odontogenic tumor (pindborg tumor)
Differentials of odontogenic tumors from mixed odontogenic tumors include?
- Ameloblastic fibroma
- Ameloblastic fibro-odontoma
- Odontoma
What is the most common developmental cyst?
-Dentigerous cyst
What is the most often location that involves a dentigerous cyst?
- Mandibular 3rds (1)
- Maxillary 3rds (2)
- Canines (3) (Max more than Mand)
What is the precursor to an odontogenic myxoma?
-Dental papilla
Parakeratinized epithelium goes with what type of cyst?
-Odontogenic keratocyst (OKC)
Orthokeratinized epithelium goes with what type of cyst?
-Orthokeratinized odontogenic cyst
How does a dentigerous cyst originate?
-A cyst that originates by separation of the follicle from around the crown of an unerupted tooth
What is the recurrence rate of an OKC?
-30%
What syndrome is and OKC associated with?
- Gorlin’s syndrome
- AKA Nevoid basal cell carcinoma
What gene does and OKC deal with?
-PTCH gene (chromosome 9)
Why is the recurrence rate of an OKC 30%?
- Thin, friable wall
- Epithelial lining is 6-8 layers thick
- Basal cell layer is palisading and hyperchromatic
- Daughter cysts
Is there basal cell palisading in and orthokeratinized odontogenic cyst?
-No
What is the most common location of an orthokeratinized odontogenic cyst?
-Posterior mandible
What are the 5 categories that lesions can be?
- Physical trauma
- Inflammatory/infection
- Metabolic
- Developmental
- Neoplastic
What cyst are ghost cells associated with?
-Calcifying odontogenic cyst (gorlin cyst)
What other odontogenic lesion is associated with and COC?
-Odontoma
What are snowflake calcifications dealing with?
Adenomatoid Odontogenic Tumor
What tooth is and AOT most associated with?
-Canine
What is the “driven snow” pattern associated with?
-Calcifying epithelial Odontogenic Tumor (CEOT)
What is the other name for a CEOT?
-Pindborg tumor
What tumor is and amyloid like extracellular material that is positive for congo red associated with?
-CEOT
What is the most common odontogenic tumor?
-Odontoma
What type of odontoma is composed of multiple small toothlike structures?
-Compound
What type of odontoma is composed of a conglomerate mass of enamel and dentin and doesn’t look like a tooth?
-Complex
What is considered a hamartoma rather than a true neoplasm?
-Odontoma
T/F an ameloblastic fibroma is a true mixed tumor with both epithelial and mesenchymal tissues
True
