Radiolucent Lesions Tutorial

Question 1

What are seen histologically here?

Answer 1

Hyaline or Rushton bodies

Question 2

What are Hyaline/Rushton bodies?

Answer 2

Eosinophilic bodies of varying size/shape
- unknown origin

Question 3

How are cysts sent to the pathology lab?

Answer 3

Placed into 10% formalin sample pot
- ensure pts details on label

Question 4

Why are dentigerous cysts most commonly associated with lower 8s and upper 3s?

Answer 4

these teeth have highest rate of impaction

Question 5

What pathology is imaged here?

Answer 5

Dentigerous cyst

Question 6

How do you interpret the difference between an enlarged follicle vs dentigerous cyst?

Answer 6

< 2.5mm = follicle
> 4.2mm = probable cyst
> 10mm = definite cyst

Question 7

what is the aetiology of dentigerous cysts?

Answer 7

attachment of cyst lining at/near the ACJ suggests that these cysts occur as a result of cystic change in the remains of the enamel organ

Question 8

How do odontogenic keratocysts appear histologically?

Answer 8

Question 9

What happens if an odontogenic keratocyst is aspirated?

Answer 9

White or creamy semi-solid material aspirated (low soluble protein content)

Question 10

What syndrome is associated with multiple odontogenic keratocysts?

Answer 10

Basal Cell Nevus syndrome / Gorlin-Goltz syndrome

Question 11

What are the features of Gorlin-Goltz syndrome?

Answer 11

Multiple:
- basal cell carcinomas
- skeletal abnormalities
- skin pigmentation

Question 12

What is the maximum diameter of a normal incisive fossa?

Answer 12

6mm

Question 13

How do nasopalatine duct cysts form?

Answer 13

Via epithelial remains of the embryonic nasopalatine canal