Odontogenic Tumors

Question 1

sources of tumor cells in ameloblastoma

Answer 1

may originate from dental lamina dura, developing enamel organ, odontogenic cyst lining, alveolar mucosa

Question 2

different types of ameloblastoma

Answer 2

1. solid / mutlicystic / convenitonal
2. unicystic
3. demoplastic
4. peripheral ameloblastoma

Question 3

most common location of ameloblastoma

Answer 3

posteiror mandible

Question 4

clinical features of ameloblastoma

Answer 4

asymtomatic, often discovered on routine radiographs

as tumors grow, painless enlargement may be noted

Question 5

radiographic features of ameloblastoma

Answer 5

1. unilocular radiolucency, especially early lesions that often progress to multilocular (soap bubble)
2. may be associated with impacted tooth
3. cortical expansion and thinning

Question 6

two most common histological variants of ameloblastoma

Answer 6

follicular
plexiform

Question 7

follicular ameloblastoma

Answer 7

islands of adontogenic epitehlium

Question 8

plexiform ameloblastoma

Answer 8

interconnected strands of eptihlium

Question 9

peripheral cells

Answer 9

resemble ameoloblasts (columnar with palisaded nuclei away form basement membrane, reverse nuclear polarity)

Question 10

central cells

Answer 10

dendritic extensions that interdigitate, resemble stellate reticulum

Question 11

treatment of ameloblastoma

Answer 11

complete surgical incision

Question 12

treatment of larger lesions ameloblastoma

Answer 12

en bloc or segmental resection

Question 13

treatment of smaller ameloblastoma lesions

Answer 13

aggressive curittage
liquid nitrogen

Question 14

prognosis of ameloblastoma

Answer 14

depends on tumor size, extent, locaiton

maxillary tumors may extend into sinonasal cavity and beyond

Question 15

recurrence potential of ameloblastoma

Answer 15

recurrence varies with type of treatment, lesion length of follow up

Question 16

demographic of calcifying epitehlial odontogenic tumor

Answer 16

20-60 years (mean 40)

Question 17

clinical featores of CEOT

Answer 17

slow growing painless swelling

often associated with impacted tooth, third molar

Question 18

radiographic features of CEOT

Answer 18

radiolucent, with or without driven snow radiopacities

uni / multilocular

Question 19

microscopic features of CEOT

Answer 19

islands and sheets of polyhedral cells with abundant eosinophilic cytoplasm, sharply defined cytoplasmic borders and well developed intercellular bridge

variable pleomorphism of cell and nculei (giant nuclei) but without mitotic figures

Question 20

stain techniqeu used to detect presence of amyloid in tumors

Answer 20

congo red

Question 21

liesegang ring resembles

Answer 21

lamellated calcifications

Question 22

rate of recurrence of CEOT

Answer 22

up to 15%

greater tendency to recur if treated with curettage

Question 23

tissue of origin of adenomatoid odontogenic tumor

Answer 23

enamel organ or dental lamina origin

Question 24

demogrpahics of AOT

Answer 24

90% <30 years, 50% teens

Females > males

Anterior maxilla and mandible

Most common area: impacted maxillary canine

Question 25

clinical featores of AOT

Answer 25

-displacement of teeth -cortical bony hard expansion

Question 26

radiographic features of aot

Answer 26

When associated with impacted teeth, tendency for radiolucent argin to extend apically past the CEJ

Question 27

dentigerous cyst vs AOT on radiographic

Answer 27

dentigerous cyst stops at cervical margin aot radiolucency can go way beyond the cervical marign

Question 28

histopathological features of AOT

Answer 28

-thick capsule -sheets of eptihelial cells, cellular whorles (rosettes) and duct like structures resembling glandular (adenomatoid) tissue

Question 29

treatment of AOT

Answer 29

enucleation

Question 30

demographics of ameloblastic fibroma

Answer 30

1st and 2nd decade mean 14.8

Question 31

clinical features of ameloblastic fibroma

Answer 31

posteiror mandible painless swelling

Question 32

radiographic features of ameloblastic fibroma

Answer 32

unilocular radiolucency, often wit unerupted tooth (50%), may become multilocular

Question 33

histopathology of ameloblastic fibroma

Answer 33

anastomosoing strands, knots of eptihelium

Question 34

treatment of amelolastic fibroma

Answer 34

conservative excision, aggressive curettage

Question 35

two types of odontomas

Answer 35

compound complex

Question 36

compoudn odontoma

Answer 36

usually anteiror jaw

Question 37

complex odontoma

Answer 37

usually posteiror jaw

Question 38

radiographic features of compound odontoma

Answer 38

collection of tiny tooth-like denticles, surrounded by lucen zone (soft tissue capsule)

Question 39

radiographic features of complex odontoma

Answer 39

opacity surrounded by broad zone of lucency (soft tissue capsule)

Question 40

clinical features of compound odontoma

Answer 40

dysmorphic tooth germs, enamel matrix due to decalcification

Question 41

clinical features of complex odontoma

Answer 41

irregular convoluted mass of dentin, enamel matrix, cementoid tissue ghost cells

Question 42

demogrpahics of odontogenic myxoma

Answer 42

Age range: 1-73 years (mean 30) Slightly more common in females

Question 43

preferred location of odontogenic myxoma

Answer 43

2/3 cases in mandible (molar region)

Question 44

clinical features of odontogenic myxoma

Answer 44

Painless expansion, cortical perforation Maxillary tumors fill up sinus early

Question 45

radiogrpahic features of odontogenic myxoma

Answer 45

Multilocular, honeycomb appearance in radiographs Short straight bone septa

Question 46

management of small odontogenic myxoma lesions

Answer 46

aggressive curettage

Question 47

management of larger odontogenic myxoma

Answer 47

marginal or en bloc resection

Question 48

demographics of cementoblastoma

Answer 48

Age 8-44 years (mean 20) No gender preference

Question 49

location of cementoblastoma

Answer 49

posterior mandible especially 1st permanent molar

Question 50

clinical features of cementoblastoma

Answer 50

Pain and swelling often presenting features Rarely, lower lip paresthesia or pathologic fracture of mandible

Question 51

radiograhic features of cementoblastoma

Answer 51

Opaque mass fused to root(s), thin lucent rim around mass Tooth resorption, loss of root outline, obliteration of periodontal ligament