Odontogenic Cysts & Tumors

Question 1

Dentigerous Cyst

most common

commonly seen 2

radio 5

diff dx 2

transform 3

Answer 1

• Most common development cyst
• Most commonly seen with 3rd molars and max canines
• Radio app
  
  • Must be with unerupted teeth
  • RL area around the crown of the tooth, attached at the CEJ
    
    • RL area must be > 2mm, otherwise its a normal follicle
  • Any size can be uniocular or multiocular
  • Can push teeth
  • Top diff dx: odontogenic keratocyst, unicystic ameloblastoma
• Epithelium may transform to ameloblastoma, SCC, mucoepidermoid carcinoma

Question 2

Lateral Periodontal Cyst

considered a

location

tooth

Answer 2

• True cyst
• 75% in premolar-canine area
• Teeth can be vital or non vital

Question 3

Odontogenic Keratocyst

common

mimics

app 4

assoc

Answer 3

• Common cyst with high recurrence rate
• Can look like anything, mimics other cysts/tumors
  
  • uniocular or multiocular
  • Pericoronal, apical, or lateral position
  • Small or large
  • BUT only in odontogenic area
• Associated with Gorlins Syndrome (nevoid basal cell carcinoma syndrome)

Question 4

Calcifying Odontogenic Cyst

radio app 2

histo

Answer 4

• Only cyst that may be mixed RL-RO (odontogenic tumors can also be mixed)
• May also be totally RL
• Has ghost cells histologically

Question 5

Ameloblastoma

most common

age

radio 4

location

Answer 5

• Most common true odontogenic tumor
• Age 20-40
• Radio
  
  • Always RL
  • Classic soap bubble app
  • Causes expansion
  • May be uniocular (unicystic ameloblastoma)
  • Most common location is post mand

Question 6

Ameloblastic Fibroma

Ameloblastic Fibro-odontoma

Answer 6

• Age <20
• Post mand most common
• Precursors to odontoma
• Radio
  
  • AF= completely RL
  • AFO= mixed RL/RO

Question 7

Odontoma

develops

Radio

2 kinds

Answer 7

• Develops first 2 decades of life
• RO area surrounded by RL rim, surrounded by thin RO line
• Compund: Identifiable toothlets, usually in ant max
• Complex: large unidentifiable mass, post mand

Question 8

Adenomatoid Odontogenic Tumor

demo 2

location 2

radio

Answer 8

• 2/3 tumor
• 2/3 teens
• 2/3 females
• 2/3 ant jaw
• 2/3 max
• often with unerupted tooth
• May be RL or mixed
  
  • Mixed RL with snow flake calcifications

Question 9

Odontogenic Myxoma

demo

radio 3

Answer 9

• Younger patients < 30
• Radio- resembles ameloblastoma
  
  • Honeycomb or tennis racket app
  • Septations at 90 degrees to one another