Radiolucent Odontogenic Lesions

Question 1

What is the components of a cyst? Characteristics?

Answer 1

1. Connective tissue
2. Epithelial lining
3. Lumen

• Persistant and progressive
• Slow growing

Question 2

What is the most common cyst of the jaw? Radiographic findings? Cause?

Answer 2

Radicular cyst.

-Well defined.
-Radiolucent
-Loss of lamina dura
Caused by infected tooth

Question 3

What are the radiographic features of lateral periodontal cyst? Cause?

Answer 3

-Well defined
-Radiolucent
-Less than 1 cm
Caused by infected tooth.

Question 4

What is the most common developmental cyst?

Answer 4

Dentigerous cyst.

Question 5

What are the radiographic features of dentigerous cyst? Treatment?

Answer 5

• Well defined unilocular/multilocular radiolucency around the CEJ and crown of unerupted tooth.
• Removal of tooth and curettage of lesion.

Question 6

What is an eruption cyst?

Answer 6

Soft tissue analogue of dentigerous cyst. Cant usually see it on radiograph because its not in bone.

Question 7

What are the odontogenic keratocyst characteristics? Radiographic? What can it mimic?

Answer 7

• Grows in anterior-post direction in mandible.
• Does not cause expansion only in body of mandible.
• High rate of recurrence because of mini cysts it creates.
• Well defined, corticated, unilocular/multi, usually displaces teeth.
• Can mimic other lesions.

Question 8

What are the clinical findings of Gorlin/Nevoid basal cell carcinoma syndrome?

Answer 8

• Multiple basal cell carcinomas
• Multi odonto keratocysts
• Calcified falx cerebri
• Rib anomalies
• Palmar plantar pits

Question 9

What is an ameloblastoma? Characteristics? Treatment?

Answer 9

Benign tumor of ameloblasts.

• Always Radiolucent and Odontogenic
• Slowly growing
• Classically multilocular
• Significant expansion

Has a marked tendency to recur because it sends out tumor islands. Surgical removal with 1-2 cm margins of surrounding bone.

Question 10

What is unicystic ameloblastoma? Characteristics?

Answer 10

Variant of alemoblastoma.

• Tumor lines cystic cavity with no invasion, so can be treated successfully with enucleation.
• Affects younger patients.

Question 11

What is peripheral ameloblastoma?

Answer 11

Ameloblastoma on gingiva.

Question 12

What is ameloblastic fibroma? Characteristics?

Answer 12

Odontogenic benign tumor.

• ALWAYS occurs in patients under 20.
• Always radiolucent odontogenic.

Question 13

What is central odontogenic fibroma? Characteristics?

Answer 13

Benign odontogenic tumor

• radiolucent.
• Does not infiltrate bone.
• Looks like other cysts and tumors.

Question 14

What is an odontogenic myxoma? Characteristics?

Answer 14

Benign odontogenic tumor.

• Radiolucent, poor or well defined borders.
• Infiltrates surrounding bone due to gelatinous structure.
• Honeycomb septations.