ORAL PATH non-odontogenic cysts

Question 1

where do non-odontogenic cysts derive from?

Answer 1

sources other than tooth-forming organ

Question 2

list 3 non-odontogenic cysts?

Answer 2

nasopalatine duct cyst
surgical ciliated cyst
nasolabial cyst

Question 3

clinical features of nasopalatine duct cysts?

Answer 3

uncommon
occur anywhere in the nasopalatine canal, frequently the palatal end
slow growing
swelling in middle of anterior palate
‘salty’ taste

Question 4

where do nasopalatine duct cysts originate from?

Answer 4

nasopalatine duct in the incisive canal

Question 5

radiographic features of nasopalatine duct cyst?

Answer 5

rounded or heart-shaped radiolucency in midline of anterior hard palate

Question 6

what are different presentations of nasopalatine duct cysts?

Answer 6

median palatine cyst
incisive canal cyst
median alveolar cyst

Question 7

what is the key histopathological feature of nasopalatine duct cysts?

Answer 7

neurovascular bundles in capsule

Question 8

treatment for nasopalatine duct cysts and recurrence rate?

Answer 8

enucleation
recurrence is unlikely

Question 9

what are clinical features of surgical ciliated cysts?

Answer 9

most located posterior mandible, following trauma/ surgery where sinus/ nasal mucosa is implanted in the jaw
may be asymptomatic or present with pain and swelling

Question 10

what is the incidence of surgical ciliated cysts?

Answer 10

rare
F=M
50-60years old

Question 11

histopathology of surgical ciliated cysts?

Answer 11

cyst lined with respiratory epithelium
fibrous connective tissue capsule - may be ifnlammed

Question 12

treatment for surgical ciliated cysts and recurrence rate?

Answer 12

enucleation
recurrence is rare

Question 13

incidence of nasolabial cysts?

Answer 13

very rare
F>M
40-50 years old

Question 14

clinical features of nasolabial cysts?

Answer 14

arise in upper lip below nose, lateral to midline
slow growing, distorts nostril
painless unless infected
10% bilateral

Question 15

where do nasolabial cysts derive from?

Answer 15

remnants of the embryonic nasolacrimal duct or the lower anterior portion of the mature duct

Question 16

histopathology of nasolabial cysts?

Answer 16

cystic lesion with fibrous capsule
pseudostratified columnar epithelium lining

Question 17

treatment for nasolabial cysts?

Answer 17

excision

Question 18

list the types of soft tissue cysts?

Answer 18

salivary mucocoele
epidermoid cyst
dermoid cyst
lymphoepithelial cyst
thyroglossal duct cyst

Question 19

clinical features of an epidermoid cyst?

Answer 19

painless swelling
often following trauma or surgery
more common on the skin

Question 20

key histopathological feature of epidermoid cysts?

Answer 20

no skin appendages in cyst wall

Question 21

treatment for epidermoid cysts?

Answer 21

excision

Question 22

clinical features of dermoid cyst?

Answer 22

developmental lesion
various locations in head and neck
FOM common site
painless swelling in midline

Question 23

key histopathological feature of dermoid cysts?

Answer 23

skin appendage in cyst wall e.g., sebaceous gland, hair follicle

Question 24

treatment for dermoid cysts?

Answer 24

excision

Question 25

clinical features of lymphoepithelial cysts?

Answer 25

developmental lesions uncommon but do occur in oral cavity FOM most common intraoral site painless small swelling yellowish in colour

Question 26

treatment for lymphoepithelial cysts?

Answer 26

excision

Question 27

clinical features of thyroglossal duct cysts?

Answer 27

near the hyoid bone midline swelling painless symptoms if infected

Question 28

where do thyroglossal duct cysts derive from?

Answer 28

developmental cysts that derive from embryonic thyroglossal duct

Question 29

what malignant lesion may you incidentally find when investigating a thyroglossal duct cyst?

Answer 29

thyroid carcinoma

Question 30

treatment for thyroglossal duct cysts and recurrence rate?

Answer 30

excision - 'sistrunk procedure' (removal of mid third of hyoid bone) lower chance of recurrence

Question 31

what are the types of non-epithelialised primary bone cysts?

Answer 31

simple (or solitary) bone cyst aneurysmal bone cyst

Question 32

why are non-epithelialised primary bone cysts not true cysts?

Answer 32

they are not lined by epithelium

Question 33

where do you find non-epithelialised primary bone cysts?

Answer 33

mandible

Question 34

clinical features of simple (solitary) bone cysts?

Answer 34

premolar/molar regions of the mandible may be asymptomatic swelling or often incidental finding

Question 35

treatment for simple (solitary) bone cysts?

Answer 35

resolve spontaneously resolve after opening of cavity

Question 36

clinical features of aneurysmal bone cysts?

Answer 36

very rare in the jaws - usually in mandible painless swelling

Question 37

treatment for aneurysmal bone cysts and recurrence rate?

Answer 37

curettage may recur

Question 38

what is stafne's defect?

Answer 38

idiopathic bone cavity not a true lesion developmental anomaly due to part of the submandibular gland indenting lingual mandible appears cyst like on radiograph