Odontogenic Tumours

Question 1

odontogenic tumours?

Answer 1

• rare
• benign > malignant
• majority asymptomatic (pain usually secondary to infection)
• mostly arise within bone of jaws

Question 2

what are the 3 groups of odontogenic tumours?

Answer 2

• epithelial
• mesenchymal
• mixed (epithelium & mesenchymal)

Question 3

What are the odontogenic sources of epithelium?

Answer 3

• rests of malassez (epithelial root sheath)
• rests/glands of serres (remnants of dental lamina)
• reduced enamel epithelium (remnants of enamel organ)

Question 4

general radiographic appearances of odontogenic tumours?

Answer 4

• entirely radiolucent <-> mixed <-> entirely radiopaque

Question 5

what is an ameloblastoma?

Answer 5

• benign epithelial tumour (locally destructive but slow growing, painless usually)

Question 6

radiographic appearance of ameloblastoma?

Answer 6

Question 7

what are the histological types of ameloblastoma?

Answer 7

• follicular
• plexiform
• desmoplastic

Question 8

management of an ameloblastoma?

Answer 8

• surgical resection with margin
• recurrence relatively common
• risk of malignant transformation (<1% chance)

Question 9

what is an adenomatoid odontogenic tumour (AOT)?

Answer 9

• benign epithelial tumour
• unilocular radiolucency with internal calcification around crown of unerupted maxillary canine is classic presentation
• majority occur in anterior maxilla

Question 10

adenomatoid odontogenic tumour (AOT) presentation?

Answer 10

• 75% associated with unerupted tooth (usually maxillary canine)
• unilocular radiolucency
• majority have internal calcifications & radiopacities
• margins well defined

Question 11

what is a calcifying epithelial odontogenic tumour (CEOT)?

Answer 11

Question 12

Presentation of calcifying epithelial odontogenic tumour (CEOT)?

Answer 12

• slow growing but can become large
• half are associated with an unerupted tooth
• radiolucency often with internal radiopacities (calcifications of varying sizes)
• variable radiographic presentation otherwise

Question 13

what is Odontogenic myxoma?

Answer 13

• benign mesenchymal tumour
• incidence (3-6% odontogenic tumours)

Question 14

Odontogenic myxoma: presentation?

Answer 14

Question 15

Odontogenic myxoma: histology?

Answer 15

Question 16

management of an odontogenic myxoma?

Answer 16

• curettage or resection (depending on size)
• high recurrence rate: 25%

Question 17

what is an odontoma?

Answer 17

Question 18

Types of odontoma?

Answer 18

1. compound odontoma (ordered dental structures, may appear as lots of mini teeth)
2. complex odontoma (disorganised mass of dental tissues)