Odontogenic cysts and tumors

Question 1

What is considered normal measurements in a dentigerous cyst?

Answer 1

-3 mm

Question 2

What is the definition of an odontogenic cyst?

Answer 2

-Pathologic cavity lined by odontogenic epithelium and filled with fluid

Question 3

Differentials of odontogenic cysts include what?

Answer 3

• Dentigerous cyst
• Odontogenic keratocyst
• Orthokeratinized odontogenic cyst
• Calcifying odontogenic cyst

Question 4

Differentials of odontogenic tumors from odontogenic epithelial origin?

Answer 4

• Adenomatoid odontogenic tumor

- Calcifying epithelial odontogenic tumor (pindborg tumor)

Question 5

Differentials of odontogenic tumors from mixed odontogenic tumors include?

Answer 5

• Ameloblastic fibroma
• Ameloblastic fibro-odontoma
• Odontoma

Question 6

What is the most common developmental cyst?

Answer 6

-Dentigerous cyst

Question 7

What is the most often location that involves a dentigerous cyst?

Answer 7

• Mandibular 3rds (1)
• Maxillary 3rds (2)
• Canines (3) (Max more than Mand)

Question 8

What is the precursor to an odontogenic myxoma?

Answer 8

-Dental papilla

Question 9

Parakeratinized epithelium goes with what type of cyst?

Answer 9

-Odontogenic keratocyst (OKC)

Question 10

Orthokeratinized epithelium goes with what type of cyst?

Answer 10

-Orthokeratinized odontogenic cyst

Question 11

How does a dentigerous cyst originate?

Answer 11

-A cyst that originates by separation of the follicle from around the crown of an unerupted tooth

Question 12

What is the recurrence rate of an OKC?

Answer 12

-30%

Question 13

What syndrome is and OKC associated with?

Answer 13

• Gorlin’s syndrome

- AKA Nevoid basal cell carcinoma

Question 14

What gene does and OKC deal with?

Answer 14

-PTCH gene (chromosome 9)

Question 15

Why is the recurrence rate of an OKC 30%?

Answer 15

• Thin, friable wall
• Epithelial lining is 6-8 layers thick
• Basal cell layer is palisading and hyperchromatic
• Daughter cysts

Question 16

Is there basal cell palisading in and orthokeratinized odontogenic cyst?

Answer 16

-No

Question 17

What is the most common location of an orthokeratinized odontogenic cyst?

Answer 17

-Posterior mandible

Question 18

What are the 5 categories that lesions can be?

Answer 18

• Physical trauma
• Inflammatory/infection
• Metabolic
• Developmental
• Neoplastic

Question 19

What cyst are ghost cells associated with?

Answer 19

-Calcifying odontogenic cyst (gorlin cyst)

Question 20

What other odontogenic lesion is associated with and COC?

Answer 20

-Odontoma

Question 21

What are snowflake calcifications dealing with?

Answer 21

Adenomatoid Odontogenic Tumor

Question 22

What tooth is and AOT most associated with?

Answer 22

-Canine

Question 23

What is the “driven snow” pattern associated with?

Answer 23

-Calcifying epithelial Odontogenic Tumor (CEOT)

Question 24

What is the other name for a CEOT?

Answer 24

-Pindborg tumor

Question 25

What tumor is and amyloid like extracellular material that is positive for congo red associated with?

Answer 25

-CEOT

Question 26

What is the most common odontogenic tumor?

Answer 26

-Odontoma

Question 27

What type of odontoma is composed of multiple small toothlike structures?

Answer 27

-Compound

Question 28

What type of odontoma is composed of a conglomerate mass of enamel and dentin and doesn’t look like a tooth?

Answer 28

-Complex

Question 29

What is considered a hamartoma rather than a true neoplasm?

Answer 29

-Odontoma

Question 30

T/F an ameloblastic fibroma is a true mixed tumor with both epithelial and mesenchymal tissues

Answer 30

True