E2: Cysts of the Jaws Flashcards
What are the four essential features that make a “cyst”?
1. Pathological cavity (not natural)
#2. Filled with fluid
#3. Lined by epithelium
#4. Connective tissue wall
Which of the 4 characteristics of a cyst qualifier would be seen on a radiograph?
pathological cavity
Where is a typical location of a cyst?
- Usually inside bone, may be in soft tissues
- Rarely in condyle or coronoid process
- Odontogenic cysts in tooth bearing areas
The borders of a cysts are described as
- Well‐defined, smooth
- Corticated (any white line)
- Irregular or sclerotic if infected (crisp white line called sclerosis)
The shape of the cysts are described as
- Spherical (on cross‐sections)
- Circular (on 2‐D images)
- Oval, when contacts a hard surface, e.g., cortical bone or roots
- Scalloped border (seashell)
What are the effects of cysts?
- Slow growing
- Displaces roots, may resorb
- Displaces IAC (mandible) or sinus floor (maxillary)
- Sharp and smooth border
- Expands or perforates cortical plates
The radiographic appearance of cysts is described as
- Radiolucent: Loss of bone
- Distinct border: Slow growing, Fluid filled balloon or Soft tissue mass
- Fluid: hydraulic pressure (pushes in all directions)
At what size can you see the corticated borders of a cyst?
5mm or more
A small cyst that’s 2mm is not going to show a corticated border
What are the 3 different classification of cysts?
inflammatory, developmental and “other”
What are the two types of inflammatory cysts?
radicular and inflammatory collateral cysts
What are the different types of developmental cysts?
- Dentigerous
- Odontogenic keratocyst
- Lateralperiodontal
- Glandular odontogenic
- Nasopalatine
DO-NGL
What are the different types of radicular cysts?
apical and lateral
The lateral radicular cyst usually results from what part of the tooth?
accessory canals
The apical radicular cyst usually results from what part of the tooth?
main pulp canal
What are the different types of inflammatory collateral cysts?
buccal bifurcation and paradental
What type of cyst?
radicular
What type of cyst?
residual
What type of cyst?
dentigerous
What type of cyst?
lateral periodontal (between two roots)
What type of cyst?
glandular (a group of cysts between two roots)
What type of cyst?
OKC (oral keratinized cyst, elongated)
What type of cyst?
nasopalatine (only between incisors, only from nasopalatine canal)
What type of cyst?
simple bone cyst (not a true cyst because it’s not fluid filled)
What type of cyst?
mucous retention cyst (not a true cyst because it’s mucus, not fluid)