Tumours

Question 1

3 tissue origin groups

Answer 1

Epithelial
Mesenchymal
Mixed

Question 2

give the epithelial odontogenic tumours

Answer 2

Ameloblastoma
Adenomatoid odontogenic tumopur
Calcifying epithelial odontogenic tumour

Question 3

Describe ameloblastoma , histo and radio

Answer 3

Epithelial benign tumour that is locally invasive and slow growing
Post mandible

Multicystic thick curved septa (soap bubble appearanece)
well def corticated radiolucency

Histo
Amelo blast like cells
Stellate reticulum like tissue
Fibrous tissue
Cystic change

Question 4

Describe Adenomatoid odontogenic tumour

Answer 4

Benign epithelial tumour
Anterior maxilla

Same as dentigerous (unerupoted tooth) but typically attaches apical to CEJ

Histo
Patchy calcifications
Duct like structure

Question 5

Describe odontogenic myxoma

Answer 5

Benign mesenchymal tumour

Well defined radiolucency +/- thin corticated margins
Small = unilocular
Larger = multilocular (soap bubble)

Histo
L
- Loose myxoid tissue with stellate cells
- No capsule
- islands of inactive odontogenic epithelium

Question 6

Describe Odontoma

Answer 6

Benign mixed tumour

Compound = ordered mass of dental hard tissue

Complex = disoragnised mass of dental hard tissue

Dentine, enamel, cementum , pulp