Odontogenic Neoplasms (3) Flashcards
What are the three categories of odontogenic neoplasms?
- Tumor of odontogenic epithelium (enamel organ)
- Mixed tumors (odontogenic epithelium and odontogenic ectomesenchymal)
- Odontogenic ectomesenchymal (dental papilla)
What are the three neoplasms of odontogenic epithelium?
- Ameloblastoma
- Adenoid odontogenic tumor
- Calcifying epithelial odontogenic tumor
What are the three odontogenic neoplasms of mixed origin?
- Ameloblastic fibroma
- Ameloblastic fibro-odontoma
- Odontoma
What are the two neoplasms of odontogenic mesenchymal origin?
- Odontogenic myxoma
2. Cementoblastoma
T/F: Ameloblastomas are benign, painless tumors.
True
What is the most frequent tumor of odontogenic origin?
Ameloblastoma
T/F: Ameloblastomas will often perforate the bone.
False
Will cause dramatic expansion of bone
What is the most common location for Ameloblastomas?
Posterior mandible
T/F: Ameloblastoma radiolucencies are often described as “soap bubble” or “honeycomb”.
True
T/F: Enamel is produced by ameloblastoma cells.
False
Resemble ameloblasts but no enamel is produced
What attributes to the recurrence of ameloblastomas?
Tumor often infiltrates bony trabeculae
What are the two common histopathological patterns seen in ameloblastomas?
Follicular and plexiform
Ameloblastomas are seen as __________ showing cuboidal or columnar cells at the periphery.
Tumor islands
T/F: Ameloblastomas have cells with nuclei polarized away from the basement membrane.
True
Reverse polarization
What are the treatment options for an ameloblastoma?
Small - aggressive curettage or small en bloc resection
Large - large en bloc resection or segmental resection
What is the prognosis of an ameloblastoma?
Guarded
Simple curettage recurrence 50%-90%
Resection recurrence 15%
Rare malignant transformation
What is a peripheral ameloblastoma?
Soft tissue variant of an ameloblastoma
Seen as gingival bumps
T/F: Peripheral ameloblastomas will be seen as a radiolucency on a radiograph.
False
No radiographic findings
What is the treatment/prognosis for peripheral ameloblastoma?
Biopsy/local excision
Limited recurrence
______________ is an asymptomatic tumor of odontogenic epithelium often seen in patients under 20 y.o.
Adenomatoid odontogenic tumor (AOT)
T/F: Odontogenic myxomas are sometimes seen in bones other than the jaw.
False
Only in the jaw bones
T/F: Odontogenic myxomas can have a soap bubble radiographic appearence.
True
Odontogenic myxoma and ameloblastoma