5. Non-Odontogenic Cysts Flashcards
What is the presentation and location of the Torus Mandibularis?
- Usually bilateral, but can be unilateral in 10%
- Pearl-like projections of the lingual body of the mandible in the premolar area
What is the Radiographic appearance of the Stafne Bone Cyst? (4)
- Well defined circular/oval RL of posterior mandible near angle, BELOW mandibular canal, hyperostotic border
- Can be superimposed on canal depending on angulation of beam
- May be RL but NOT a true cyst
- Not going to be in a place where most odontogenic neoplasms or cyst are, so it is not going to mimic any of them = Almost Radiographically Diagnostic
What is the pathogenesis of the Median Palatal Cyst?
Fissural cyst developing from residual epithelial rests trapped between the palatal sutures/shelves that fuse during embryogenesis
What appears as a RL dead center in the mandible?
- Median Mandibular Cyst
- Most MMC’s represent Large Periapical Cysts or OKC’s
Differential Diagnosis (5)
Solid lesion presenting as a RL in the globulomaxillary area
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Adenomatoid Odontogenic Tumor (AOT)
- Anterior maxilla, never past PM
- Young persons
- Central Giant Cell Granuloma
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Desmoplastic Ameloblastoma
- Only Ameloblastoma that loves this area, but not purely RL
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Ameloblastic Fibroma
- Can occur there but uncommon in anterior jaws
-
Odontogenic Myxoma
- Can occur in any tooth-bearing area, but prefers posterior mandible
How does the Torus Palatinus appear on a radiograph?
Shows up as a RL 2x, not in the midline - artifact
What is the radiographic appearance of the Median Palatal Cyst?
Well demarcated midline palatal RL, but posterior to incisal canal area
What population does the Torus Palatinus affect?
25% of the population
- Female 2:1
- Asians/Eskimos
What is the pathogenesis of Buccal Exostoses?
May be reactive to trauma from occlusion - bruxism pts
What is the Treatment for the Stafne Bone Cyst?
Observe Only
What was the theory on the etiology of the Median Mandibular Cyst?
- In theory, a cyst of the symphysis arising from entrapped epithelium during embryonic fusion
- In reality, no fusion takes place & there is no opportunity for epithelial entrapment because fusion occurs so deeply in mesenchyme, that the epithelium is destroyed so you don’t have epithelial rests
What is the clinical appearance of the Nasopalatine Duct Cyst? (4)
- Most asymptomatic
- Some expansile, painfull
- Drainage out of papilla, can cause salty taste
- Can show a bulge on the palatal or labial side
How does the Traumatic Bone Cyst present?
- Hollow cavity in the mandible, also seen in the femur and tibia
- Asymptomatic, occasionally painless swelling
- Teeth are vital
What is the radiographic appearance of the Globulomaxillary Cyst (not real)?
- Inverted pear-shaped RL in between the maxillary lateral & canine that diverges both roots
- Globulomaxillary area = between maxillary lateral & canine
What is the most common non-odontogenic cyst?
Nasopalatine Duct Cyst
In what age group does the Median Palatal Cyst occur?
2nd decade