Differentials

Question 1

5 white lesions that can be scraped off

Answer 1

• materia alba
• toothpaste allergy
• white coated tongue
• burn (chemical, thermal, cotton roll, etc.)
• pseudomembranous candidiasis

Question 2

white lesions that cannot be scraped off

Answer 2

• linea alba
• morsicatio buccarum/linguarum/laborium
• leukoplakia
• leukoedema
• nicotine stomatitis
• oral hairy leukoplakia
• lichen planus
• scar tissue
• tobacco pouch keratosis
• verrucous carcinoma

Question 3

papillary lesions

Answer 3

• squamous papilloma
• verruca vulgaris
• condyloma accuminatum
• verruciform xanthoma
• sinonasal papilloma

Question 4

lesions that can cross the midline

Answer 4

• central giant cell granuloma
• dentigerous cyst
• glandular odontogenic cyst
• odontogenic keratocyst
• traumatic bone cyst

Question 5

blue swellings

Answer 5

• hemangioma
• mucocele
• mucoepidermoid carcinoma
• gingival cyst of the adult
• eruption cyst
• peripheral giant cell granuloma

Question 6

large unilocular radiolucency in the mandible

Answer 6

• OKC
• ameloblastoma (can cause root resorption)
• dentigerous cyst (impacted tooth)
• central giant cell granuloma (crosses midline)

Question 7

mixed RL-RO

Answer 7

• COC
• AOT
• CEOT
• odontomas
• ameloblastic fibro-odontoma
• ossifying fibroma

Question 8

focal area of increased radiodensity

Answer 8

• idiopathic osteosclerosis
• focal cemento-osseous dysplasia (RL rim)
• condensing osteitis (associated with inflammation)
• cementoblastoma (attached to root surface)
• bone scar

Question 9

benign fibro-osseous lesions

Answer 9

• fibrous dysplasia
• cemento-osseous dysplasia
• ossifying fibroma

Question 10

cause root resorption

Answer 10

• ameloblastoma

- osteosarcoma

Question 11

soap bubble or honeycomb

Answer 11

ameloblastoma

Question 12

moth-eaten

Answer 12

metastatic tumors to the jaws

Question 13

sunburst appearance

Answer 13

osteosarcoma

Question 14

spiking resorption

Answer 14

osteosarcoma

Question 15

downward bowing of mandible

Answer 15

ossifying fibroma

Question 16

ghost cells

Answer 16

COC

Question 17

snowflake calcifications

Answer 17

AOT

Question 18

driven snow

Answer 18

CEOT

Question 19

cotton wool

Answer 19

pagets disease

Question 20

ground glass

Answer 20

fibrous dysplasia

Question 21

blood-soaked sponge

Answer 21

aneurysmal bone cyst

Question 22

blow-out or ballooning distention of affected bone

Answer 22

aneurysmal bone cyst

Question 23

positive for congo red

Answer 23

CEOT

Question 24

pindborg tumor

Answer 24

CEOT

Question 25

gorlin cyst

Answer 25

COC

Question 26

white lesion that goes away when tissue is stretched

Answer 26

leukoedema

Question 27

whickam’s striae

Answer 27

lichen planus

Question 28

sawtooth rete ridges

Answer 28

lichen planus

Question 29

clinically blanches under pressure

Answer 29

• hemangioma

- dioscopy is the test

Question 30

cauliflower appearance

Answer 30

squamous papilloma

Question 31

serpentine border

Answer 31

geographic tongue aka erythema migrans aka benign migratory glossitis

Question 32

most common benign neoplasm of the oral cavity

Answer 32

fibroma

Question 33

most common tumor of infancy

Answer 33

hemangioma

Question 34

most common developmental cyst

Answer 34

dentigerous cyst

Question 35

most common odontogenic tumor

Answer 35

odontoma

Question 36

most common fibro-osseous lesion encountered in clinical practice

Answer 36

cemento-osseous dysplasia

Question 37

most common malignancy to originate in bone, excluding hematopoietic neoplasms

Answer 37

osteosarcoma

Question 38

most common form of cancer involving bone

Answer 38

metastatic carcinoma

Question 39

floats in formalin

Answer 39

lipoma