Chapter 15 lecture 3 Flashcards
Where do ameloblastomas infiltrate between?
- Cancellous bone
- Lesion periphery
What is the most widely used treatment to remove an ameloblastoma?
-Marginal resection
How far beyond the margins do surgeons take out an ameloblastoma?
-1.5 cm
What does a peripheral ameloblastoma look like?
- Painless
- Nonulcerated
- Sessile gingival lesion
Where are peripheral ameloblastomas most commonly found and are they more on the maxilla or mandible?
-Posterior gingival mucosa on the mandible
What is the recurrence of a peripheral ameloblastoma?
15% the first time almost 0% the second time
Malignant ameloblastomas shows metastatic deposits where most commonly?
-Lung
T/F A malignant ameloblastoma is not cancerous
True
T/F An ameloblastic carcinoma is not cancerous
False
-It is cancerous
When do ameloblastic carcinomas develop?
-Later in life than conventional ameloblastomas and malignant ameloblastomas
A malignant ameloblastoma has histologic features that look similar to what?
-Conventional ameloblastoma
What age does an adenomatoid odontogenic tumor occur in?
-10-20
What gender and area do adenomatoid odontogenic tumors most commonly occur?
- Anterior maxilla
- Females
Adenomatoid odonteginc tumors are asymptomatic and discovered during and XRAY to determine why a tooth hasn’t erupted, what tooth is most often involved?
-Canine
In 75% of adenomatoid odonteogenic tumors the tumor is what?
-Circumscribed, unilocular radiolucency involving the crown of an unerupted tooth
What helps determine and adenmatoid odontgenic tumor from a dentigerous cyst?
- Radiolucency often extends apically past the CEJ
- Snowflake calcifications
What might the lesions look like in an XRAY for and adenomatoid odontgenic tumor?
-Snowflake calcifications
T/F Adenomatoid odontogenic tumors are malignant
False
-They are completely benign
What is a calcifying epithelial odontogenic tumor aka?
-Pindborg Tumor
Where do calcifying epithelial odontogenic tumors most often occur?
-Posterior mandible
What is the most common presenting sign of a calcifying epithelial odontogenic tumor?
- Painless
- Slow growing swelling
What does “driven snow” pattern deal with?
-Calcifying epithelial odontogenic tumor
What impacted tooth is a calcifying epithelial odontogenic tumor most often associated with?
-Mandibular molar
What are the calcifications with concentric rings formed in the amyloid like areas in a calcifying epithelial odontogenic tumor known as?
-Liesegang rings
What is the stain they use to exhibit and apple-green birefringence in a calcifying epithelial odontogenic tumor?
-Congo Red
What is an ameloblastic fibroma?
-True mixed tumor that has both epithelial and mesenchymal tissues that are neoplastic
What age to ameloblastic fibromas usually occur?
-Before age 20
Where are most ameloblastic fibromas located?
-Posterior mandible most commonly with an unerupted tooth
What does the histology of an ameloblastic fibro-odontoma appear similar to?
-Ameloblastic fibroma except the ameloblastic fibro-odontoma has enamel and dentin
What are the four differentials that have calcifications?
- Calcifying odontogenic cyst
- Adenomatoid odontogenic tumor
- Calcifying epithelial odontogenic tumor
- Ameloblastic fibro-odontoma
What is the malignant counterpart of the ameloblastic fibroma?
-Ameloblastic fibrosarcoma
What is the avg age of a person who gets an ameloblastic fibrosarcoma?
-25-30
What is the avg age of a person who gets and ameloblastic fibro-odontoma?
10
Where do most ameloblastic fibrosarcomas occur?
-Mandible
What is the most common odontogenic tumor?
-Odontoma
What is an odontoma considered to be?
-considered to be developmental anomalies (hamartomas) rather than true neoplasms
What is a compound odontoma?
-Composed of multiple small toothlike structures
What is a complex odontoma?
-Conglomerate mass of enamel and dentin but bears no anatomic resemblance of a tooth
What is the avg age of a person who gets an odontoma?
15
Where is a compound odontoma more common in?
-Anterior maxilla
Where is a complex odontoma more common in?
-Molar regions
What is a central odontogenic fibroma’s extraosseous counterpart?
-Peripheral odontogenic fibroma
Where do myxomas only occur in?
-Jaws
What jaw does an odontogenic myxoma occur in more commonly?
-Mandible
What is a wispy trabeculae of residual bone associated with?
-Odontogenic myxoma
