Odontogenic Cysts/Tumors

Question 1

A pathologic cavity lined by odontogenic epithelium and filled with fluid or semisolid material is called a?

Answer 1

Odontogenic Cyst

Question 2

What are 4 examples of Odontogenic cysts?

Answer 2

1-Dentigerous cyst
2-Odontogenic Keratocyst
3-Orthokeratinized odontogenic cyst
4-Calcifying odontogenic cyst

Question 3

What are two Odontogenic tumors of epithelial origin?

Answer 3

1-Adenomatoid odontogenic tumor (AOT
)
2-Calcifying epithelial odontogenic tumor (CEOT)

Question 4

What are 3 examples of mixed odontogenic tumors?

Answer 4

1- Ameloblastic fibroma
2-Ameloblastic fibro-odontoma
3-Odontoma

Question 5

A cyst that originates by separation of the follicle from around the crown of an unerupted tooth is called?

Answer 5

Dentigerous cyst

*most common developmental cyst

Question 6

Which type of cysts have a 30% recurrence rate, associated with gorlin syndrome, has thin friable wall and shows pleasing basal cell layer?

Answer 6

Odontogenic keratocyst

*gorlin AKA nevoid basal cell carcinoma syndrome, PTCH gene

Question 7

Which cyst type does not have basal palisading, is most common in posterior mandible and typically unilocular?

Answer 7

Orthokeratinized Odontogenic Cyst (OOC)

*rarely recur after enucleation

Question 8

AKA gorlin cyst, what is typically found in the incisor/canine region and is unilocular, well defined RL?

Answer 8

Calcifying odontogenic cyst (COC)

*1/3 associated with unerupted canine

Question 9

Which cyst has a tendency for anterior jaw (mx>md), is usually discovered determining why tooth hasn’t erupted and has fine, snowflake calcifications?

Answer 9

Adenomatoid Odontogenic Tumor (AOT)

*usually canine, F:M 2:1

Question 10

AKA pinborg tumor, which cyst is most commonly a painless, slow-growing swelling and appears like driven snow?

Answer 10

Calcifying Epithelial Odontogenic Tumor (CEOT)

*amyloid apple-green with birefringence, congo-red, lisegang rings

Question 11

What is the most common odontogenic tumor and what are the two types?

Answer 11

Odontoma

1-Compound (multiple small teeth)
2-Complex (conglomerate mass)

Question 12

What true mixed tumor (epithelial and mesenchymal) are in younger patients usually in the posterior mandible?

Answer 12

Ameloblastic Fibroma

Question 13

What appears like an ameloblastic fibroma, except it has enamel and dentin?

Answer 13

Ameloblastic Fibro-odontoma

Question 14

What is the differential for a mixed RL-RO lesion?

Answer 14

1-AOT (adenomatoid odontogenic tumor)
2-COC (Calcifying odontogenic cyst)
3-AFO (ameloblastic fibro-odontoma)
4-CEOT (Calcifying epithelial odontogenic tumor)