Developmental Cysts Exam 2

Question 1

What is a cyst ?

Answer 1

A sac or cavity lined with epithelium and enclosed in connective tissue
Well-circumscribed

Question 2

What can a cyst be classified as?

Answer 2

Odontogenic- epithelium was related to tooth development
Nonodontogenic- epithelium was not related to tooth development but came from fusion of embryonic processes

Question 3

What is the Odontogenic Cysts?

Answer 3

• Entrapped epithlium grows, accumulates fluid and induces reactive fibrous tissue formation
• Epithelium can come from enamel organ, the reduced enamel epithelium, epithelial rests of malassez or residual dental lamina,
• Classified acording to lovatin cause or origin of the epithelium

Question 4

What is intraosseous Odontogenic cysts?

Answer 4

• Dentigerous or follicular cyst
• Primordial cyst
• Ondontogenic Keraocyst
• Lateral periofontal cyst
• Periapical cyst
• Residual cyst

Question 5

What is extraosseous Odontogenic cysts?

Answer 5

• Eruption cyst
• Ginigval cyst

Question 6

What are dentigerous or follicular cyst ?

Answer 6

forms around the crown of an unerupted tooth

Treatment- complete removal of cyst, usually the tooth also

Question 7

What are eruption cyst?

Answer 7

-Similar to dentigerous cyst but it is found in the soft tissue around the crown of an erupting tooth
- Tooth can erupt through cyst
- No treatment necessary

Question 8

What is primordial cyst ?

Answer 8

• Develops in place of tooth
• Treatment involves complete removal

Question 9

What is odontogenic Keratocyst

Answer 9

• Develops from the dental lamina or its remnants
• Mostly found in **males ** in the mandibular posterior region
• Treatment: surgical removal and careful followup

Question 10

What is periodontal cysts?

Answer 10

• Arise from remenants of epithelial rests of malassez in the PDL
• Occurs because of a result of infection from the pulp chamber- chronic condition, tooth non-vital

*Treatment for both is surgical removal

Question 11

Periodontal Cyst (Radicular Cyst)

Answer 11

• Most Common cyst seen in the oral cavity
• Caused by pulpal inflammation
• Develops in a pre-existing periapical granuloma in non-vital tooth
• Treatment: surgical removal, should be microscpoically examined- rarely squamous cell carcinoma develops

Question 12

What is Residual Cyst ?

Answer 12

• Forms when part of a periapical cyst is left behind
• Appears as well circumscribed radiolucency at the site of the extraction
• Treatment- Surgical removal

Question 12

What is gingival cysts ?

Answer 12

• Gingival cysts of the newborn- remnants of the dental lamina degenerate and form cysts
• Filled with kertain so appear as multiple white nodules

Question 12

What is Palatal cysts of the newborn?

Answer 12

• epsteins pearl- epithelium entrapped during fusion of the palate
• Bohns nodules- minor salivary glands appears as firm, small, whote nodules in groups anywhere in the hard palate
• Usually resolve and need no treatment

Question 13

What is gingival cyst of the adult?

Answer 13

• Arises from dental lamina (rests of Serres)
• Similar to lateral periodontal cyst in site and behavior
• Treatment- Surgical removal

Question 14

What is nonodontogenic cysts

Answer 14

• occur when epithelium becomes entrapped during fusion of embryonic processes
• Also called fissural cysts
  *occur in bone or soft tissue

Question 15

What is a nasoplatine (incisive canal) cyst ?

Answer 15

• Forms from remnants of the nasopalatine duct
• Located within the incisive canal or incisive papilla
• most are asymptomatic found on routine radiographs
• radiographically appears as well as a well defined heart shaped
• surgical removal

Question 16

what is a median palatine cyst ?

Answer 16

• Forms from epithelium trapped during fusion of the palatine processes
• Found in the midline of the palate, more posterior than the nasopalatine cyst
• Radiographically appears as well defined, unilocular radiolucency
• Treatment- Surgical removal

Question 17

What is Globulomaxilary cyst ?

Answer 17

odontogenic origin
Found between maxillary lateral and canine
Radiographically appears as well defined upside down pear shaped
Surgical removal

Question 18

What is the median mandibular cyst ?

Answer 18

Appears below the apices of the incisors
Surgical removal

Question 19

What is Nasolabial Cyst?

Answer 19

• Epithelium believed to come from remnants of the nasolacimal duct
• Found: Junction of the globular, lateral nasal and maxillary processes
• Clinically appears as a swelling in the mucolabial fold in the area of the canine fossa, more common in females
• no radiographic evience since is in soft tissue
• Treatment-surgical removal

Question 20

What is Lymphoepithelial (Branchial cleft) Cyst

Answer 20

• Arises from epithelium, trapped in a cervical lymph node during development
• Intraorally, floor of the mouth and lateral borders of the tongue most common
• on the sternocleidomastoid muscle
• Clinically appears- pinkish-yellow nodule or moveable mass on the nexk
• Treatment- surgical removal prognosis is good

Question 21

Epidermoid and Dermoid Cysts

Answer 21

• Epidermoid- Arise from epithelium of the hair follicle and resemble the epidermis (face, neck scalp)
• Dermoid- include in the cyst wall hair follicles (oral cavity floor of the mouth
• If between teeth is called- teratoma

Question 22

What is thyroglossal tract cyst?

Answer 22

• Develops from remnants of the duct that served as the path for the thyroid gland to migrate from the oral cavity
• Senn mostly in children
• Occurs below the hyoid bone
• Treatment- surgical removal of the cyst
• 5% recurrence rate and some cases have carcinoma arise