Cysts and Odontogenic Tumors 3

Question 1

• An expansile, slow-growing, locally invasive lesion, typically
of posterior mandible of adults (mean = 35 y)
• Recurrence is common, but does not metastasize *
• The histopathology of ameloblastoma recapitulates the
enamel organ
• does not form and hard tissue

Answer 1

Ameloblastoma

Question 2

The histopathology of ameloblastoma recapitulates the

________

Answer 2

enamel organ

Question 3

______ histo:

• Ameloblastic islands
• Stellate reticulum in lumen
• Reverse polarity in epithelium

Answer 3

Follicular ameloblastoma

Question 4

• Anterior jaws, equally distributed between mandible and
maxilla
• Mottled mixed density with diffuse margins
• Solid tumor with dense, collagenous stroma

Answer 4

Desmoplastic Ameloblastoma

Question 5

_____:
Can be radiopaque or radiolucent
- contains fibrous CT that compromises the ameloclastic islands

Answer 5

Desmoplastic ameloblastoma

Question 6

____ is a soft tissue lesion of the ameloblastoma that doesn’t occur in bone

Answer 6

Peripheral ameloblastoma

Question 7

• Cystogenic ameloblastoma
• Unilocular radiolucency, usually of posterior mandible –
mimics a dentigerous cyst radiographically
• 2nd to 3rd decades (Mean age = 18 y)
• Recurrence uncommon

Answer 7

Unicystic Ameloblastoma

Question 8

Histo of \_\_\_\_\_:
• Nuclear hyperchromatism
• Nuclear palasading
• Reverse polarity of basal cell nuclei
• Subnuclear vacuolation

Answer 8

Unicystic Ameloblastoma

Vickers-Gorlin Change

Question 9

What are the demographics for adenomatoid odontogentc tumor?

Answer 9

Young females in anterior maxilla

Question 10

If the histo shows pseudoducts, what is the lesion?

Answer 10

Adenomatoid odontogenic tumors

Question 11

• Adults (Mean = 40 y)
• Posterior mandible - molar-ramus region
• Recurrence, but less aggressive than ameloblastoma

Answer 11

Calcifying Epithelial

Odontogenic Tumor

Question 12

Histo of _____:
• A solid epithelial tumor (not cystic)
• Pink polygonal polyhedral epithelial cells
• Contains amyloid
• Concentric Liesegang ring calcifications

Answer 12

Calcifying Epithelial

Odontogenic Tumor

Question 13

______ is the soft tissue version of the CEOT that does not occur in bone

Answer 13

Peripheral CEOT

Question 14

• Ectomesenchymal odontogenic neoplasm
• Young adults (Mean = 30 y)
• The mandible more commonly involved than the maxilla
• A radiolucency, often multiolcular, may cross midline
• An unencapsulated lesion - recurrence is common
-High recurrence

Answer 14

Odontogenic myxoma

Question 15

histo of _____:
• Resembles dental papilla, with stellate and spindled cells in a
myxoid extracellular matrix
• Termed myxofibroma if there is increased collagen
• Odontogenic rests variable

Answer 15

Odontogenic myxoma

Question 16

• Most common in adult females (2 : 1) (mean age = 40 y)
• Well-circumscribed unilocular or multilocular lucency of
anterior maxilla and posterior mandible
• +/- radiopaque flecks
• One-third of cases are associated with an unerupted tooth
• Treatment by enucleation and vigorous curettage

Answer 16

Odontogenic Fibroma

Question 17

• Mature, fibrous stroma with varying amounts of inactive
odontogenic epithelium
• Epithelium-poor type - simple type
• Epithelium-rich type - complex type (WHO-type)

Answer 17

Odontogenic Fibroma

Question 18

• Neoplasm
• Young adults < 25 years
• Mandibular first molar
• Pain, expansion, root destruction
• Does not recur after complete removal

Answer 18

Cementoblastoma

Question 19

• “Kiddie” tumor (Mean = 14.8 y)
• A painless swelling of posterior mandible
• Well-circumscribed lucency, frequently associated with the
crowns of impacted teeth
• Treatment by enucleation and curettage. May recur

Answer 19

Ameloblastic Fibroma

Question 20

Histo of ______:
• Ectomesenchyme resembling dental papilla
• Epithelial strands and cords resembling dental lamina and
enamel organ

Answer 20

Ameloblastic Fibroma

Question 21

• A “kiddie” tumor (mean age = 8 to 12y)
• Most frequent in posterior mandible
• A unilocular or multilocular mixed density lesion, often associated with the crown of an unerupted tooth
• Less common than ameloblastic fibroma
• Treatment by enucleation. Recurrence is rare

Answer 21

Ameloblastic Fibro-

Odontoma

Question 22

What separates Ameloblastic Fibro-

Odontoma from ameloblastic fibroma?

Answer 22

Ameloblastic Fibro-

Odontoma has mixed RO/ RL appearance

Question 23

• Histologic features of ameloblastic fibroma, with the

presence of dentin and enamel

Answer 23

Ameloblastic Fibro-Odontoma

Question 24

• Teenagers
• Viewed an a hamartoma
• Well-circumscribed
• Treated by enucleation
• No recurrence expected
• Compound - anterior maxilla
• Complex - posterior mandible

Answer 24

Odontoma

Question 25

Which odontoma is seen in anterior maxilla and look like malformed mini teeth?

Answer 25

Compound odontoma

Question 26

Which odontoma is mostly seen in posterior mandible that looks like a large portion of RO flecks together?

Answer 26

Complex odontoma

Question 27

20% of ________ are associated with odontomas

Answer 27

Gorlin Cysts

Question 28

(Mixed Epithelial and Mesenchymal Odontogenic Tumors)

Mimics early stage of odontogenesis

Answer 28

Ameloblastic fibroma

Question 29

(Mixed Epithelial and Mesenchymal Odontogenic Tumors)

Mimics intermediate stage of odontogenesis

Answer 29

Ameloblastic fibro-odontoma

Question 30

(Mixed Epithelial and Mesenchymal Odontogenic Tumors)

Mimics end stage of odontogenesis

Answer 30

Odontoma