Odontogenic Neoplasms

Question 1

• Benign epithelial, odontogenic tumour
• Unicystic
• Relatively high prevalence
• Usually males 30-40
• 80% mandible, 70% posterior
• BRAF mutation in 90%

Answer 1

Ameloblastoma

Question 2

• Benign epithelial odontogenic tumour
• Younger patients (teens)
• F>M
• Mostly anterior maxilla
• Unilocular, radiolucent + radiopaque
• Surrounds unerupted crown/whole tooth esp. upper canine
• DIFFICULT TO DIFFERENTIATE FROM DENTIGENOUS CYST BUT RADIOPAQUE MARGIN

Answer 2

Adenomatoid odontogenic tumour

Question 3

If you see a radiolucency surrounding an unerupted upper canine, what might make you think it is something other than a dentigeous cyst?

Answer 3

Radiopaque border = Adenomatoid odontogenic tumour (AOT)

Question 4

Fibrous capsule, with sheets and strangs of epithelium of epithelium in FCT forming duct like structures:

Answer 4

Adenomatoid odontogenic tumour

Question 5

2 examples of benign, epithelial odontogenic tumours:

Answer 5

• Ameloblastoma
• Adenomatoid Odontogenic Tumour

Question 6

2 examples of benign mixed epithelial and mesenchymal odontogenic tumours:

Answer 6

1. Ameloblastic fibroma
2. Odontoma

Question 7

• Benign MIXED epithelial and mesenchymal tumour
• Rare, aggressive
• Usually under 21 yo
• Premolar to molar
• Unilocular radiolucency, well defined margin

Answer 7

Ameloblastic fibroma

Question 8

Ameloblastic fibromas exist on a spectrum and may evolve into:

Answer 8

Complex odontoma

Question 9

• Benign epithelial and mesenchymal MIXED tumour
• Radiographically - radiopaque mass surrounded by radiolucent zone

Answer 9

ODONTOMA

Question 10

1 example of a benign mesenchymal odontogenic tumour

Answer 10

• Odontogenic Myxoma

Question 11

• Benign mesenchymal odontogenic tumour
• Radiographically - unilocular or multilocular radiolucency, well defined margin, honeycomb

Answer 11

Odontogenic myxoma