Odontogenic Tumors

Question 1

Most common epithelial odontogenic tumor with locally aggressive characteristics

Answer 1

Ameloblastoma

Question 2

Sources of ameloblastoma

Answer 2

Odontogenic epi arising from developing enamel organ or lining of the cyst - Dentigerous cyst

Question 3

Mandibular molar ramus area, impacted teeth - 3rd molar, 35-45 years of age, slow growing painless

Answer 3

Ameloblastoma

Question 4

Types of ameloblastoma

Answer 4

Conventional solid/multicystic -86%
Unicystic
Peripheral/extraosseus

Question 5

Painless swelling, expansion of the jaw, multilocular radiolucency well defined sclerotic margins - SOAP BUBBLE or HONEYCOMB appearance on xray

Answer 5

Ameloblastoma - multicystic type

Question 6

Ameloblastoma in young adults

Answer 6

Unicystic ameloblastoma

Question 7

Treatment of ameloblastoma

Answer 7

Marginal resection
Enucleation for unicystic type

Question 8

Microscopic patterns of ameloblastoma

Answer 8

Plexiform
Follicular - COMMONEST FORM
acanthomatous
granular
Desmoplastic
Basal cell type

Question 9

Ameloblastic fibroma?

Answer 9

True mixed tumor
Both epi and CT present
Younger patients - 12years
Mandibular molar ramus region

Question 10

Ameloblastic fibroma odontoma

Answer 10

Contains Epi CT and odontoma
Children
Mixed on xray

Question 11

Calcifying epithelial odontogenic tumor also known as

Answer 11

PINDBORG TUMOR

Question 12

Features of calcifying epithelial odontogenic tumor

Answer 12

Molar ramus region
Slow painless swelling
30-50 yrs of age
Impacted 3rd molars
Unilocular or multilocular

Calcifying- radiopaque
Epi
No CT

Question 13

Large polygonal epithelial cells CT areas of amyloid showing LIESEGANG RINGS

Answer 13

Calcifying epithelial odontogenic tumor - PINDBORG TUMOR

Question 14

Adenonatoid odontogenic tumor

Answer 14

Females
10-19years
Anterior maxilla - impacted max canine
Asymptomatic

Question 15

Types of adenomatoid odontogenic tumor

Answer 15

Follicular form - most common unilocular radiolucency, crown of unerupted tooth - canine, tumor can extend past CEJ

Extrafolicular form - not associated with impacted crown, unilocular lesion between roots of erupted teeth

Question 16

Radiolucent with fine calcifications giving snowflake look

Answer 16

Adenomatoid odontogenic tumor

Question 17

Aggressive intraosseus lesion arise from odontogenic mesenchyme from dental pulp or follicular CT

Answer 17

Odontogenic Myxoma

Question 18

Root resorption, teeth displacement, cortical expansion, multilocular or unilocular radiolucency giving SOAP BUBBLE or TENNIS RACKET appearance on the xray in young adults - 25-30 yrs of age in mandible

Answer 18

Odontogenic myxoma

Question 19

Haphazardly arranged stellate, spindle shaped round cells in LOOSE MYXOID STROMA - gelatinous with few collagen fibrils

Answer 19

Odontogenic myxoma

Question 20

Proliferation of functional cementoblasts that form a large mass of cementum or cementum like tissue around mandibular first molar in the 2nd or 3rd decade of life

Answer 20

Cementoblastoma
True cementoma

Question 21

Comparison between hypercementosis and cementoblastoma

Answer 21

Hypercementosis - no pain/swelling, can trace the shape of the root and lamina dura

Cementoblastoma - pain swelling root resorption no root shape seen

Question 22

Radiographic mass fused with roots
Surrounded by thin radiolucent rim
Root resportion

Answer 22

Cementoblastoma

Question 23

Most common odontogenic tumor

Answer 23

Odontoma

Question 24

Benign mixed epi and CT tumor -hamartomatous lesion found over unerupted teeth containg enamel dentin pulp

Answer 24

Odontoma

Question 25

Types of odontoma

Answer 25

Complex Compound

Question 26

Children young adults, posterior jaws Amorphour opaque mass on tooth bearing area between roots or over the impacted tooth crown

Answer 26

Compound odontoma

Question 27

Children young adult with anterior jaws involved showing multiple tooth like structurs (teeth in sac)

Answer 27

Complex odontoma