Cysts and Odontogenic Tumors 3 Flashcards
(30 cards)
• 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
Ameloblastoma
The histopathology of ameloblastoma recapitulates the
________
enamel organ
______ histo:
- Ameloblastic islands
- Stellate reticulum in lumen
- Reverse polarity in epithelium
Follicular ameloblastoma
• Anterior jaws, equally distributed between mandible and
maxilla
• Mottled mixed density with diffuse margins
• Solid tumor with dense, collagenous stroma
Desmoplastic Ameloblastoma
_____:
Can be radiopaque or radiolucent
- contains fibrous CT that compromises the ameloclastic islands
Desmoplastic ameloblastoma
____ is a soft tissue lesion of the ameloblastoma that doesn’t occur in bone
Peripheral ameloblastoma
• Cystogenic ameloblastoma
• Unilocular radiolucency, usually of posterior mandible –
mimics a dentigerous cyst radiographically
• 2nd to 3rd decades (Mean age = 18 y)
• Recurrence uncommon
Unicystic Ameloblastoma
Histo of \_\_\_\_\_: • Nuclear hyperchromatism • Nuclear palasading • Reverse polarity of basal cell nuclei • Subnuclear vacuolation
Unicystic Ameloblastoma
Vickers-Gorlin Change
What are the demographics for adenomatoid odontogentc tumor?
Young females in anterior maxilla
If the histo shows pseudoducts, what is the lesion?
Adenomatoid odontogenic tumors
- Adults (Mean = 40 y)
- Posterior mandible - molar-ramus region
- Recurrence, but less aggressive than ameloblastoma
Calcifying Epithelial
Odontogenic Tumor
Histo of _____:
• A solid epithelial tumor (not cystic)
• Pink polygonal polyhedral epithelial cells
• Contains amyloid
• Concentric Liesegang ring calcifications
Calcifying Epithelial
Odontogenic Tumor
______ is the soft tissue version of the CEOT that does not occur in bone
Peripheral CEOT
• 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
Odontogenic myxoma
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
Odontogenic myxoma
• 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
Odontogenic Fibroma
• Mature, fibrous stroma with varying amounts of inactive
odontogenic epithelium
• Epithelium-poor type - simple type
• Epithelium-rich type - complex type (WHO-type)
Odontogenic Fibroma
- Neoplasm
- Young adults < 25 years
- Mandibular first molar
- Pain, expansion, root destruction
- Does not recur after complete removal
Cementoblastoma
• “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
Ameloblastic Fibroma
Histo of ______:
• Ectomesenchyme resembling dental papilla
• Epithelial strands and cords resembling dental lamina and
enamel organ
Ameloblastic Fibroma
- 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
Ameloblastic Fibro-
Odontoma
What separates Ameloblastic Fibro-
Odontoma from ameloblastic fibroma?
Ameloblastic Fibro-
Odontoma has mixed RO/ RL appearance
• Histologic features of ameloblastic fibroma, with the
presence of dentin and enamel
Ameloblastic Fibro-Odontoma
- Teenagers
- Viewed an a hamartoma
- Well-circumscribed
- Treated by enucleation
- No recurrence expected
- Compound - anterior maxilla
- Complex - posterior mandible
Odontoma
