Developmental and Odontogenic Cysts

Question 1

Nasopalatine duct cyst
Median Palatal cyst
Nasolabial cyst
Thyroglossal duct cyst
Branchial cleft cyst
Lymphoepithelial cyst
Dermoid cyst

These are all what?

Answer 1

Developmental non odontogenic cyst

Question 2

Most common developmental cyst

seen in patients aged 30-50 yrs
Male>Female

Appears as a swelling in the anterior palate

Well circumscribed radiolucency in the midline of the anterior maxilla

Answer 2

Nasopalatine Duct Cyst

Question 3

These are rare and develop from epitherlium entrapped along the embryonic line of fusion of the lateral palatal shelves of the maxilla

Young adults

Appears as a swelling in the midline of the hard palate

Well circumscribed radiolucnecy in the midline of the hard palate, best seen on occlusal radiographs

Answer 3

Median palatal cyst

Question 4

Arise from epithelial remnants along the lines of fusion of the maxillary process, medial nasal and lateral nasal processes

Female > male

appears as a swelling of the upper lip lateral to the mid line

Obliteration of the maxillary mucobuccal fold

Usually asymptomatic

Answer 4

Nasolabial cyst

Question 5

uncommon
arise from the remnants of the thyroglossal duct epithelium
occur in patients below 20 yrs of age
presents as a fluctuant movable swelling in the anterior midline of the neck
painless unless infected

Answer 5

Thyroglossal Duct cyst

Question 6

seen in young adults 20-40 yrs

presents as a swelling in the upper lateral neck along the anterior border of the sternocleidomastoid muscle

Answer 6

branchial cleft cyst

Question 7

keratin filled cyst within lymphoid tissue
any age, common in young adults

Appears as a small white or yellow soft tissue mass

Develops in areas of the mouth where lymphoid tissue is present

Floor of mouth. ventral and posterior lateral tongue, palatine tonsil, soft palate

Answer 7

lymphoepithelial cyst

Question 8

most common in children and young adults

Presents as a fluctuant midline swelling in the floor of the mouth
If its above geniohyoid muscle = sublingual swelling
below geniohyoid muscle = submental swelling

Painless and slow growing

Answer 8

Dermoid cyst

Question 9

Eruption cyst
dentigerous cyst
Odontogenic Keratocyst
Orthokeratinizing Odontogenic cyst
Gingival cyst of the New Born
Gingival cyst of the Adult
Lateral periodontal cyst
Calcifying Odontogenic cyst
Glandular Odontogenic cyst

are all what?

Answer 9

Developmental odontogenic cysts

Question 10

Develops as a result of separation of the dental follicle from around the crown of the erupting tooth that is within the soft tissues

Children younger than 10

Associated with deciduous or permanent incisors and permanent 1st molars

Appears as a soft, translucent swelling in the gingival mucosa overlying the crown of the erupting tooth

Usually asymptomatic

Answer 10

Eruption cyst

Question 11

Most common developmental cyst

Any age but usually 10-30 yrs old

Any unerupted tooth, commonly mandibular 3rd molars

Rx - appears as a well defined radiolucent lesion associated with the crown of the impacted tooth

Answer 11

dentigerous cyst

Question 12

Common odontogenic cyst

Any age but usually 10-40

Mandible > Maxilla

Can be associated with Gorlin Syndrome

Well defined unilocular or multilocular radiolucency; it can mimic other odontogenic cysts

Microscopic features: cyst lining epithelium is uniformly thin (3-7 cell layers)

Answer 12

Odontogenic Keratocyst

Question 13

Uncommon odontogenic cyst

young adults: mandible > maxilla

not a specific clinical type but a odontogenic cyst with orthokeratinized epithelial lining

Unilocular or multilocular radiolucency

Answer 13

Orthokeratinizing Odontogenic cyst

Question 14

common lesions

maxillary alveolus > mandibular alveolus

Appears as multiple small white papules on the alveolar mucosa

Present in soft tissues

Micro: cyst lined by flattened epithelium

Answer 14

Gingival cyst of the New Born

Question 15

Uncommon lesion

found in patients aged 40-50 yrs

tends to occur in the mandibular premolar, canine, lateral incisor area

typically located on the facial gingiva

appears as painless bluish or blue-gray dome shaped swelling

Answer 15

Gingival cyst of the Adult

Question 16

uncommon odontogenic cyst

Patients age 40-60 yrs

Typically occurs in the mandibular premolar, canine, lateral incisor area on the lateral root surface of a vital tooth

Asymptomatic, detected on routine radiographic examination

Well circumscribed radiolucent area located lateral to the roots of vital teeth

Answer 16

Lateral periodontal cyst

Question 17

uncommon, seen in any age

maxilla > mandible
anterior > posterior

Mostly found in the incisor canine areas
can be associated with an unerupted tooth

Well defined radiolucency or mixed lucent-opaque lesion

Answer 17

Calcifying Odontogenic cyst

Question 18

Rare, middle aged adults mostly

Mandible > Maxilla
Anterior > Posterior

well defined unilocular or multilocular radiolucency

Answer 18

Glandular Odontogenic cyst

Question 19

Periapical cyst
Residual cyst
Buccal Bifurcation cyst

These are all?

Answer 19

inflammatory cysts

Question 20

A true epithelium lined cyst formed by stimulation of the epithelium at the apex of a non vital tooth

asymptomatic unless acutely inflamed

The affected tooth shows negative response to vitality testing

Movement and mobility of adjacent teeth are possible

Answer 20

Periapical cyst

Question 21

A periapical cyst that is not removed at the time of extraction of the tooth

Cyst at the site of pervious tooth extraction

Appears as a persistent round to oval radiolucency at the site of previous tooth extraction

Answer 21

Residual cyst

Question 22

Uncommon: Typically develops on the mandibular first permanent molar

May result from inflammation in the follicular tissue during eruption

Children 5-13 yrs of age

Pain, swelling, pocket formation and discharge in the 1st molar area

Radiolucency involving the buccal bifurcation and roots

Answer 22

Buccal Bifurcation Cyst

Question 23

Simple bone cyst
Aneurysmal bone cyst
Stafne’s bone defect
Hematopoietic bone marrow defect

these are all?

Answer 23

Pseudo cysts

Question 24

Common
seen in young patients between 10-20 yrs of age
Males > females

typically occurs in the mandible

empty or fluid filled cavity in the bone that is devoid of an epithelial lining

Rx - superior aspect of the cyst shows SCALLOPING between the roots of teeth

Answer 24

Simple Bone Cyst

Question 25

Rare: children and young adults

Composed of blood filled spaces lined with fibrous CT

pain and swelling

unilocular or multiocular radiolucent lesion

Answer 25

Aneurysmal bone cyst

Question 26

middle aged adults

Males>females

asymptomatic radiolucency near the angle of the mandible

Represents as a focal concavity of the cortical bone on the lingual surface of the mandible

Dx based on radiographic location and lack of symptoms

Answer 26

Stafne’s Bone Defect

Question 27

Females > Males
Posterior mandible > maxilla

Asymptomatic, no expansion, detected on routine radiographic examination

Appears as a radiolucent lesion with ill defined borders and fine central trabeculations

Biopsy recommended for definitive diagnosis

Answer 27

Hematopoietic Marrow Defect