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Oral Pathology > Chapter 15 > Flashcards

Chapter 15 Flashcards

1
Q

What do mixed odontogenic tumors consist of?

A

Epithelium and mesenchymal tissues.

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2
Q

T/F: odontogenic ectomesenchyme tumors have epithelium.

A

False

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3
Q

What is the name for a cyst that originates by separation of the follicle from around the crown of an unerupted tooth?

A

Dentigerous cyst.

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4
Q

What is the most common developmental cyst?

A

Dentigerous cyst.

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5
Q

Where does the dentigerous cyst attach to the tooth?

A

Covers the crown and attaches on the CEJ.

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6
Q

What is the size for consideration of a dentigerous cyst vs the normal growth space?

A

3mm.

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7
Q

Where is the most common site for a dentigerous cyst?

A

Mandibular 3rd molars.

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8
Q

What is the soft tissue analogue of a dentigerous cyst?

A

Eruption cyst.

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9
Q

What is the likely Dx?

A

Dentigerous cyst.

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10
Q

What is the term for an eruption cyst when brusing is present?

A

Eruption hematoma.

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11
Q

What is the likely Dx?

A

Eruption cyst or eruption hematoma.

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12
Q

Gorlin syndrome is associated with what? (2 names)

What is the reoccurance rate?

A

Odontogenic Keratocyst or Keratocystic odontogenic tumor

30% reoccurance.

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13
Q

Where is the most common location for an odontogenic keratocyst?

What direction do they tend to grow?

A

Posterior mandible.

Anterior-posterior direction.

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14
Q

When will an odontogenic keratocyst mimic a dentigerous cyst?

A

When the tooth is unerupted.

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15
Q

What are the two important histology points with odontogenic keratocyst?

A

1- Palisading basal cell layer that is hyperchromatic

2- Epithelium covered by wavy or corrugated parakeratin that is 6-8 cell layers thick.

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16
Q

How is an odontogenic keratocyst Dx?

A

Biopsy.

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17
Q

What is the likely Dx?

A

Odontogenic keratocyst. Note the multi lobule

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18
Q

What is another name for Gorlin syndrome?

A

Nevoid Basal Cell Carcinoma Syndrome.

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19
Q

What gene is associated with Nevoid Basal Cell carcinoma Syndrome?

A

Chromosome 9, PTCH gene.

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20
Q

What is nevoid basal cell carcinoma syndrome characterized by?

A

1- Multiple basal cell carcinomas

2- Odontogenic Keratocyst

3- Calcification of the falx cerebri

4- Bifid rib anomalies

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21
Q

What is one of the most constant features of nevoid basal cell carcinoma syndrome?

A

Odontogenic keratocysts.

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22
Q

What is the term for an OKC that has no basal palisading and orthokeratinized lining?

A

Orthokeratinized odontogenic cyst.

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23
Q

What is the soft tissue counter part of the lateral periodontal cyst?

A

Gingival cyst of the adult.

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24
Q

Gingival cyst of the adult is derived from what?

A

Rests of Serres.

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25
Q

Where is the common site of occurance for a gingival cyst of the adult?

A

Mandibular canine and premolar area.

26
Q

How do you know that the gingival cyst of the adult will not be one of the 3 P’s?

A

Because it will be squishy rather than firm.

27
Q

How are recurrent cysts of odontogenic keratocysts characterized?

A

Thin wall, friable, daughter cysts.

28
Q

What is the likely Dx? HINT it is squishy

A

Gingival cyst of the adult.

29
Q

A lateral periodontal cyst arises from what tissue?

A

Rests of dental lamina

30
Q

What is the likely Dx?

A

Lateral periodontal cyst.

31
Q

What is the intrabony counterpart of the gingival cyst of the adult?

A

Lateral periodontal cyst.

32
Q

Where is the common occurance of the lateral periodontal cyst?

A

Mandibular canine to lateral incisor area.

33
Q

If a lateral periodontal cyst appears poly cystic, what will it be termed?

A

Botroid odontogenic cysts.

34
Q

What is the difference between an odontogenic cyst and a dentigerous cyst?

A

Odontogenic has origins from dental follicle where dentigerous has origins from an impacted tooth.

35
Q

What is a Gorlin cyst?

A

Calcifying odontogenic cyst.

36
Q

What is the term for a developmental cyst with glandular and/or salivary gland features?

A

Glandular Odontogenic Cycst.

37
Q

What is the most recently identified odontogenic cyst?

A

Glandular Odontogenic Cyst.

38
Q

What is your differential?

A

Glandular odontogenic cyst and central giant cell granuloma.

39
Q

What percent of glandular odontogenic cysts occur in the mandible?

A

75%.

40
Q

Where will a buccal bifurcation cyst likley develop?

A

Buccal aspect of the mandibular first permanent molar.

41
Q

What is the likely Dx? HINT roots are tipped lingually.

A

Buccal bifercation cyst.

42
Q

What is the most significant odontogenic tumor?

A

Ameloblastoma.

43
Q

Ameloblastomas arise from what tissue?

A

Odontogenic epithelial origin.

44
Q

What are the types of ameloblastomas?

A

Multicystic, unicystic, and peripheral.

45
Q

Where do the majority of ameloblastomas occur?

A

In the mandible usually the molar, ascending ramus area.

46
Q

What is the likely Dx?

A

Ameloblastoma. Notice the tooth displaced into the ramus.

47
Q

What are the two descriptors of ameloblastoma?

A

Soap buble when the RL loculations are large and honeycombed when the locuations are small.

48
Q

What is unique about the desmoplastic ameloblastoma?

A

Predilecion for the anterior maxilla.

49
Q

What are the histopathological features of ameloblastoma?

A

Palisading hyperchromatic basal layer and reverse polarity.

50
Q

What is the differential and what is the likely Dx?

A

Ameloblastoma, Dentigerous cyst, Odontogenic Keratocyst, Central giant cell granuloma.

Likely Ameloblastoma.

51
Q

What is the likely Dx?

A

Adenomatoid odontogenic tumor. HINT notice the “snowflake” calcifications and that extends past CEJ differentiating from dentigerous cyst.

52
Q

Where do adenomatoid odontogenic tumors occur most often?

A

Anterior jaws.

53
Q

What is the name for a Pindborg Tumor?

A

Calcifying Epithelial Odontogenic Tumor.

54
Q

What is the likely Dx?

A

Calcifying Epithelial Odontogenic Tumor. HINT notice the snowdriven pattern.

55
Q

What histopathological test will help you identify calcifying epithelial odontogenic tumor?

A

It contains amyloid-like extracellular material that will be positive for congo red which exhibits an apple-green birefringence under polarized light.

56
Q

What is the most common odontogenic tumor?

A

Odontoma

57
Q

What are the two forms of odontoma and how do you differentiate them?

A

Compund: collection of tooth like sturctures, common in anterior maxilla.

Complex: calcified mass that is common in the molar regions.

58
Q

What is the likely Dx?

A

Compound odontoma.

59
Q

What is the likely Dx?

A

Complex odontoma.

60
Q

What are Liesegang rings and what are they associated with what?

A

Calcified amyloid structures in Calcifying epithelial odontogenic tumor.

Oral Pathology (17 decks)

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