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Oral candidiasis > 17. Non-odontogenic cysts > Flashcards

17. Non-odontogenic cysts Flashcards

1
Q

What is an example of non-odontogenic cysts?

A

A non-odontogenic cyst is a cyst that is not related to the epithelial residues of the tooth forming organ.

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2
Q

What are 2 examples of epithelialised non-odontogenic bone cysts?

A

Nasopalatine cyst
Nasolabial cyst

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3
Q

What is nasopalatine cyst origin?

A

Nasopalatine duct epithelium embryonic vestigial residues

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4
Q

What is nasopalatine cyst in soft tissue called?

A

Papilla palatine cyst

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5
Q

What is the symptoms of nasopalatine cyst?

A

Asymptomatic or pain on pressure
Sclerotic rim
Round/ovoid
Heart shaped
DD from normal incisive fossa
If more than 6mm likely to be a cyst
Salty taste- mucoid
Foul taste- purulent

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6
Q

What is the lining of nasopalatine cyst?

A

Stratified squamous
Pseudostratified ciliated cuboidal columnar cells
Mucous
Contains connective tissue with some mucous glands, chronic cell inflammatory infiltration, neurovascular bundles

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7
Q

What is the origin of a nasolabial cyst?

A

Nasolacrimal duct epithelial embryonic residues

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8
Q

Where does a nasolabial cyst occur?

A

Below ala of nose
In soft tissue of the upper lip
Occasionally bilateral

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9
Q

What is the symptoms of nasolabial cyst?

A

Swelling, sometimes pain
Difficulty breathing

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10
Q

What does the radiograph show for nasolabial cyst?

A

Increased radiolucency at apex of incisor teeth

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11
Q

What is the histology of nasolabial cyst?

A

Ciliated or non-ciliated
Pseudostratified ciliated columnar epithelium and goblet cells
Cuboidal epithelium
Squamous metaplasia in 2-3 layers
Cyst walls contains relatively acellular connective tissue

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12
Q

What is a solitary bone cyst?

A

Often found in mandible molar/premolar region
Bone expansion in 25%
Children and adolescents
Single lesion
No acute or prolonged inflammation

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13
Q

What is the origin of solitary bone cyst?

A

Trauma with medullary haemorrhage.
Clot liquefaction.

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14
Q

What does radiograph show for solitary bone cyst?

A

Scalloping between teeth and remote areas too

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15
Q

What is the histology of solitary bone cyst?

A

Contains air, gas, serous fluid, blood
Bony walls covered by loose fibrous vascular tissue, haemosiderin, multinucleated giant cells
No lining

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16
Q

What is an aneurysmal bone cyst?

A

Found in posterior mandible, rarer in maxilla
Primary lesions or secondary to fibro-osseous lesions and giant cell granuloma

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17
Q

What does the lesion in aneurysmal bone cyst look like?

A

Firm swelling, expansile, balloon cortex, can be painful

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18
Q

What is aneurysmal bone cyst due to?

A

Maybe due to haemodynamic disturbance in the medullary bone

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19
Q

What does the radiograph show for aneursymal bone cyst?

A

Uni or multiocular radiolucency

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20
Q

What is the histology of aneurysmal bone cyst?

A

Numerous no-endothelium lined blood filled spaces
Acellular fibrous tissue
Haemorrhage
Haemosiderin
Multinucleated giant cells
No lining

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21
Q

What is Stafne’s idiopathic bone cavity?

A

Development anomaly in mandible between angle of mandible and premolar, lingual side below ID canal
No symptoms could be bilateral
Not a cyst

22
Q

What does stafne’s idiopathic cavity look like?

A

Round, oval, well demarcated defect
Saucer shaped 3D

23
Q

What does stafne’s idiopathic bone cavity contain?

A

Ectopic submandibular salivary gland tissue
Could confirm with sialograph

24
Q

What is mucous extravasation cyst?

A

Extravasation of mucus due to ruptured duct
Mostly lower lip
Bluish/translucent submucosal swelling

25
Q

What is the histology of mucous extravasation cyst?

A

No epithelium lining
Chronic inflammatory cells
Foam cells
Granulation tissue wall
Mucin filled cavity

26
Q

What is mucous retention cyst?

A

Often due to blocked/partially obstructed duct
Almost never in lower lip

27
Q

What is the histology of mucous retention cyst?

A

Lined by epithelium
Lack of inflammation
Diilatation of duct

28
Q

What is a lymphoepithelial cyst?

A

Occurs when you get lymphoid tissue trapped in the oral mucosa and cyst formation

29
Q

Where does lymphoepithelial cysts occur?

A

Parotid gland
Lateral neck
Floor of mouth

30
Q

What is the histology of lymphoepithelial cyst?

A

Stratified squamous or pseudostratified epithelium
Entrapped by lymphoid tissue
Contains serous fluid with desquamated epithelium and lymphocytes

31
Q

Where do dermoid and epidermoid cysts occcur?

A

Many sites, including Floor of mouth
Intraoral or submental in midline

32
Q

What is the cause for dermoid and epidermoid cysts?

A

Epithelium enclavement during fusion of the mandibular and hyoid branchial arches

33
Q

What is the histology of dermoid and epidermoid cysts?

A

Orthokeratinised
Stratified squamous epithelium
With keratin debris in the lumen

34
Q

What does a dermoid cyst contain?

A

Skin appendages- hair follicles, sebaceous glands, sweat glands, erector pili muscles

35
Q

How does dermoid and epidermoid cysts occur in other locations?

A

Traumatic implantation of epithelium deep in tissues

36
Q

What is an antral cyst?

A

Pseudocyst.
Soft tissue elevation from floor of the maxillary sinus

37
Q

What is found in an antral cyst?

A

Accumulation of inflammatory exudate, no mucin

38
Q

What is the radiographic finding of antral cyst?

A

Dome shaped radiopacity

39
Q

Where do antral cysts occur most?

A

Anterior-lateral wall in sinus

40
Q

What is the symptoms of antral cyst?

A

Pain, swelling, pus discharge

41
Q

What is the reason for antral cysts occuring?

A

Most happen after surgery due to epithelial antral lining rests being left behind in surgery, and forming cysts.

42
Q

What is a branchial cyst and where does it ocur?

A

Developmental cyst
Epithelium entrapped in cervical lymph node

43
Q

Where does a branchial cyst occur?

A

Angle of mandible and anterior sternomastoid muscle border

44
Q

What are the symptoms of branchial cysts?

A

Asymptomatic
Movable mass
Clear with transillumination

45
Q

What does a branchial cyst look like?

A

Similar site and appearance to metastatic squamous cell carcinoma from primary oropharyngeal tumour

46
Q

How do you tell the difference between SCC and branchial cyst?

A

If the person is below 40-45, likely to be branchial cleft cyst.
If they are over 45-50, likely to be SCC.

47
Q

What is the cause of a thyroglossal duct cyst?

A

Developmental lesion from embryonic thyroglossal duct

48
Q

Where does thyroglossal duct occur?

A

From foramen caecum in midline of tongue, to thyroid gland
Most cysts are near the hyoid bone

49
Q

What is the lining of thryoglossal duct?

A

Stratified squamous ciliated columnar epithelium

50
Q

What does the wall of thryoglossal duct contain?

A

Thyroid tissue
Lymphoid tissue
Mucous glands

51
Q

What is the symptoms of thyroglossal duct cyst?

A

Dysphagia

Oral candidiasis (18 decks)

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