Non-Odontogenic C y s t s

Question 1

What is the most common non-odontogenic cyst?

Answer 1

Nasopalatine duct cyst

Question 2

What is the origin of a Nasopalatine duct cyst?

Answer 2

Remnants of the nasopalatine duct in the incisive cana

Question 3

Describe the possible histopathology of the lining of a Nasopalatine duct cyst.

Answer 3

Lining respiratory like or oral epithelium like.
• Mucous glands in cyst lining.
• Prominent neurovascular bundles in cyst CT wall.

Question 4

Nasopalatine duct cyst
الموقع
الاكس ري

Answer 4

swelling in the midline of the maxilla, posterior to the central incisor teeth

heart shaped radiolucenc

Question 5

What is another name for a Median palatal cyst?

Answer 5

Fissural cyst

Question 6

Median palatal cyst
المكان
الحجم
الهستو

Answer 6

Midline of palate behind incisive foramen.

Quit larger than nasopalatine duct cyst.(2-10 Cm)

Lining either respiratory like or oral epithelium like.

Question 7

3- Nasolabial cyst (nasoalveolar)
مكانه
اكثر في اي جنس

Answer 7

Soft tissue cyst affecting upper lip.
- 10% bilateral.
- Females more than males.
- Fissural cyst

Question 8

What is the most common developmental cyst in the neck

Answer 8

Thyroglossal tract cyst.

Question 9

Thyroglossal tract cyst
المنشأ
المكان
الهستو

Answer 9

Remnants of thyroglossal duct

Midline of the neck.
• In Relation to hyoid bone:

H/P:
• Lining (oral epith. or respiratory epith.)
• CT wall contain thyroid follicles

Question 10

Branchial cleft cyst
Origin
Site
H/p

Answer 10

Origin: Remnant of branchial arches

Entrapment of SG tissue in upper cervical LN.

Anterior border of sternomastoid muscle.

oral or respiratory epith.)
• C.T wall contains prominent normal lymphoid
ti

Question 11

Oral lymphoepithelial cyst
مكان
الهستو

Answer 11

arise in oral sites that rich in
lymphoid tissue (waldyer`s ring)

keratinized St. Sq. epithelium.
• CT wall is rich in normal
lymphoid tissue and germinal
centers.
• Lumen contain keratinous
debris

Question 12

What is a Dermoid cyst of the oral cavity considered a benign cystic form of?

Answer 12

Teratoma

Question 13

Dermoid cyst of oral cavity
اسباب تكونه
المكان
العمر

Answer 13

Disrupted fusion () 1st and 2nd branchial arches.

Relation to geniohyoid muscle:
• Above→ sublingual swelling
• Below→submental swelling→double chin appearance

• Children & young adults.

Question 14

Dermoid cyst of oral cavity
الهستو

Answer 14

Epithelium: epidermis like (orthokeratinized ST sq. epith.)
• CT: skin appendages (hair follicle, sweat glands, sebaceous glands)
• Lumen keratine filled

Question 15

Simple bone cyst= traumatic bone cyst.
سببه
مكانه

Answer 15

Non healing trauma of bone.
• Bone cavity filled with disintegrated blood.

mandibular canal and roots of 6,7

Question 16

Simple bone cyst= traumatic bone cyst.
الهستو
والاكس 😔ري

Answer 16

Teeth that
appear to be involved are generally vital & don’t show root resorption

The cyst cavity
contains disintegrated blood or serosanguineous fluid , few giant cell

Question 17

Aneurysmal bone cyst.
اسبابه
الجنس
الاعراض

Answer 17

Primary pathosis of bone causes disturbance in
hemodynamic circulation of bone

• Female predilection

• Rapid growing painful swelling.

Question 18

Aneurysmal bone cyst
اكس ري
هستو

Answer 18

Ill defined multilocular radiolucency showing
cortical thinning

Large Cystic Spaces separated by
Septa with MNGCs & Spindle Cs
MNGCs lining Blood
Filled Space

Question 19

Static bone cyst= stafne defect= developmental lingual
mandibular salivary gland defect
اسبابه
.

Answer 19

Ectopic Salivary gland tissue.

Question 20

Mucocele
اسباب
هستو

Answer 20

Trauma to minor SG duct

Cavity containing mucinous material
surrounded by granulation tissue.
• Acini of minor salivary gland seen near by