Cysts

Question 1

What is a cyst?

Answer 1

a pathological cavity, not formed by the accumulation of pus, with fluid or semi-fluid contents

Question 2

mechanisms for cyst growth

Answer 2

epithelial proliferation
bone resorption
internal hydraulic osmotic pressure

Question 3

Radicular cyst typical age (decade at presentation)

Answer 3

3rd and 4th

Question 4

residual cysts typical age (decade at presentation)

Answer 4

4th and 5th

Question 5

odontogenic keratocyst typical age (decade at presentation)

Answer 5

3rd and 4th

Question 6

eruption cyst typical age (decade at presentation)

Answer 6

1st and 2nd

Question 7

nasopalitine cyst typical age (decade at presentation)

Answer 7

4th, 5th and 6th

Question 8

solitary bone cyst typical age (decade at presentation)

Answer 8

2nd

Question 9

radicular cysts - most common site

Answer 9

tooth bearing areas of jaws, most commonly anterior maxilla

Question 10

residual cyst most common sites

Answer 10

mandibular premolar area

Question 11

keratocyst most common site

Answer 11

angle of mandible

Question 12

dentigerous cyst most common site

Answer 12

mandibular 3rd molar
followed by maxillary canine

Question 13

eruption cysts most common site

Answer 13

deciduous and permanent teeth, most commonly anterior to first permanent molar

Question 14

nasopalatine cyst site

Answer 14

nasopalatine canal

Question 15

solitary bone cyst site

Answer 15

mandible

Question 16

radicular cyst common clinical signs

Answer 16

slowly enlarging swellings
frequently asymptomatic
discovered by radiography of non-vital teeth

Question 17

residual cyst common clinical signs

Answer 17

frequently asymptomatic
slowly enlarging swelling

Question 18

odontogenic keratocyst common clinical signs

Answer 18

usually asymptomatic
discovered on examination or radiograph
tooth displacement
occasionally paraesthesia of lower lip

Question 19

dentigerous cyst common clinical signs

Answer 19

may grow to large size until discovered - like keratocyst
mostly discovered on radiograph due to tooth eruption failure

Question 20

nasopaline cyst common clinical signs

Answer 20

swelling of anterior plate of floor of nose

Question 21

solitary bone cyst common clinical signs

Answer 21

discovered on radiograph

Question 22

suitable radiographic views for cysts in the maxilla

Answer 22

periapcals and oblique occlusal
panoramic radiograph or lateral oblique
true lateral (anterior maxilla)

Question 23

suitable radiographic views for cysts in the mandible

Answer 23

periapicals and true occlusals
panoramic radiograph or lateral oblique

Question 24

CBCT indications for imaging of cysts

Answer 24

may be useful in planning surgery of large cysts, particularly in the maxilla

Question 25

Cysts - how the margins may appear

Answer 25

typically well defined round or ovoid radiolucency surrounded by well defined margin corticated margins usually seen except in solitary bone cysts

Question 26

signs of an infected cysts

Answer 26

may be symptomatic may appear less well-defined on radiograph

Question 27

radicular cysts - radiographic appearance

Answer 27

well defined, round or ovoid radiolucency associated with root apex corticated margin continuous with lamina dura of affected tooth

Question 28

Radicular cyst - histopathology

Answer 28

cyst lumen lined with layer of simple non-keratined squamous epithelium of variable thickness

Question 29

residual cyst - radiographic appearance

Answer 29

well defined, ovoid or round radioucency in an edentulous area - may see occasional flecks of calcification

Question 30

residual cyst pathology

Answer 30

arises form a radicular cyst that is left behind following tooth extraction histologically similar to radicular cyst

Question 31

keratocyst radiographic appearance

Answer 31

well defined radiolucency with densely corticated margins outline may be scalloped in shape expansion usually limited - propensity to grow along the medullary cavity may have multilocular appearance

Question 32

odontogenic keratocyst histology

Answer 32

lined by continuous layer of stratified squamous epithelium of even thickness

Question 33

dentigerous cyst radiographic appearance

Answer 33

pericoronal radiolucency greater than 3-4mm in width well defined, corticated radiolucency associated with the crown of an unerupted tooth attaches at the ACJ of affected tooth

Question 34

eruption cyst pathology

Answer 34

a dentigerous cyst in soft tissue over an erupting tooth histologically similar to dentigerous cyst

Question 35

nasopalitine duct cyst radiographic features

Answer 35

well defined, round radiolucency in midline of anterior maxilla may appear heart shaped due to superimposition of anterior nasal spine

Question 36

solitary bone cyst radiographic features

Answer 36

well defined but non-corticated radiolucency - expansion rare