Benign Odontogenic Tumours

Question 1

Origin of odontogenic tumours?

Answer 1

Epithelial

Mesenchymal

Mixed

Question 2

What is ameloblastoma?

Answer 2

Benign epithelial neoplasm
- slow growing
- locally invading
- high rate of recurrence

Question 3

Clinical features of amelobalstoma?

Answer 3

80% posterior body of mandible
- asymptomatic or
- swelling of the jaw

Question 4

Radiographic feature of ameloblastoma?

Answer 4

Unli / multilocular radiolucency resembling a cyst
- occasionally scalloped borders
- knife edge resorption of roots of adjacent teeth

Question 5

Histopathology of ameloblastoma?

Answer 5

Either follicular or plexiform

Follicular
- islands of odontogenic epithelium embedded in a fibrous stroma
- stellate reticulum appearance
- cystic changes
- ameloblasts like cells

Plexiform
- ameloblasts like cells
- fibrous tissue
- stellate reticulum like tissue
- anastamosing basal cells

Question 6

What is CEOT?

Histo?

Answer 6

Calcifying epithelial odontogenic tumour

• locally invasive neoplasm
• amyloid tissue that may become calcified

Variable foci of calcification

Question 7

What is AOT?

Answer 7

Adenomatoid odontogenic tumour

• benign neoplasm
• intra osseous
• associated with unerupted maxillary canines
• resembles dentigerous cyst

Question 8

‘ red flag signs of odontogenic carcinoma / sarcoma? ‘

Answer 8

Extensive bone destruction

Mobile teeth

Non-healing tooth socket

Mucosal ulceration

Parasthesia / anaesthesia of trigeminal nerve

Lymphadenopathy

Question 9

What is ameloblastic carcinoma?

Answer 9

Malignant neoplasm
- highly invasive and metastasis to lymph nodes