Radiology abnormalities Flashcards
lingual salivary gland depression
- stafne bone defect
- asymptomatic
- well-defined, ovoid UL RL immediately inferior to mandibular canal in area of 2nd or 3rd molar
- 80-90% males
- commonish 0.3%
Traumatic (simple, solitary) bone cyst
- empty cavity in bone, not really a cyst
- asymptomatic, usually in the mandible
- 10-20 years
- unilocular radiolucency
- hallmark-lesion scallops up and down between roots of teeth
- Bx necessary to secure diagnosis
- empty cavity with serosanguinous fluid
- bony fill typical after exploration
Hematopoeitic bone marrow defect
- unilocular radiolucency
- asymptomatic
- edentulous areas of posterior mandible in postmenopausal women
- no tx indicated
zygomatic air cell defect (ZACD)
- variant of normal, not a disease
- unilocular radiolucency (UL)
- ML (multilocular) RL in articular eminence or distal zygomatic arch
- symmetrical, asymptomatic
- weaker, no eminectomy
Ameloblastoma
- ML radiolucencies
- average age at dx 33 years
- 85% mandibular 3rd molar/ramus, remainder posterior maxilla
- classic appearance ML soap bubble or honeycomb RL
- swelling/expansion early
- root resorption 80% of cases
- perforation: darker area in a radiolucency
- pathologic fracture is common
Odontogenic Keratocyst (OKC)
- Multilocular RL
- asymptomatic
- 3rd molar/ramus area of mandible
- fairly well-defined UL or ML RL
- grow extensively in anterior-posterior direction before expansion
- endosteal scalloping
- starts as a different type of cyst
- Satellite/daughter cysts common
- wide excision, marsupialization, peripheral ostectomy, Carnoys solution
- long term recurrence
Nevoid Basal Cell Carcinoma (Gorlin) syndrome
- multiple OKCs
- Basal cell nevi/carcinomas (external surface)
- bifid ribs
- calcified falx cerebri
- epidermoid cysts
- palmar-plantar pits
central giant cell granuloma
- ML RL
- 60% < age 30
- 70% mandible, especially ANTERIOR
- work up for hyperparathyroidism, if it’s not that, its central giant cell granuloma
- thorough curettage, surgery
- steroids, calcitonin, interferon alpha 2a
- TWO TYPES: non-aggressive, and aggressive
aggressive central giant cell granuloma
- pain
- rapid growth..
Chronic Osteomyelitis
- Mixed rdiolucent/radiopaque lesions
- immune compromised or hypovascular bone
- subacute (2-6 weeks), ragged ill-defined RL
- Chronic (week 6+), ragged RL + RO swquestra
dental (periapical) granuloma
mass of granulation tissue at the apex of a non-vital tooth
- it is one of two forms of chronic apical pd (the other is radicular cyst), but they both look the same on rads
- patients are asymptomatic
radicular cyst
in some dental granulomas, the odontogenic epithelial rests proliferate and form a cyst
- mostly asymptomatic
- radiographically has the same appearance as dental granuloma
- root resorption common
what are radicular cysts lined with?
-nonkeratinized stratified squamous epithlium
if inflammatory debris is not curetted out at the time of tooth extration, epithelial remnants may proliferate and become…
a residual cyst
-non-keratinized stratified epithelium
residual cysts are more common where?
the maxilla
when a defected created by a pa inflammation does not fill in completely with new bone, but instead with dense fibrous connective tissue=…
-fibrous boney defect (apical scar)
what is the treatment for a fibrous boney defect?
they do not require treatment, they are a variant of normal healing
________ _________ are developmental cysts that arise during separation of the follicle from around the crown of a developing tooth with accumulation of fluid between the reduced enamel epithelium and the crown
dentigerous cysts
- they radiolucency usually has a well-defined and often sclerotic boarter
- the cyst usually attaches at the cej
what is the most common type of developmental odontogenic cysts?
dentigerous cysts
“heart shaped lesion”
-incisive canal cyst, bc of the superimposition over the anterior nasal spine
-“salty” taste when erupts
Enucleation ± marsupialization
cyst that develops along the lateral portion of a vital tooth….
- lateral periodontal cyst
- arises from degeneration of remnants of dental lamina and represents the intraosseous counterpart of the gingival cysts of the adult
- usually in the mandibular premolar-canine region, but some maxillary lesions occur
what type of epithelium lines the lateral pd cyst?
-what are the characteristic histopathologic features of the lateral pd cyst?
thin flattened squamous to cuboidal epithelium, usually 1-3 cells thick
-the lining epithelium contains focal glycogen-containing clear cells, and there are focal nodular thickenings (mural plaques)
what is a botryoid odontogenic cyst?
recurrence of the lateral pd cyst, a polycystic variant
soap bubble or honey comb looking radiolucency=
ameloblastoma
which cysts have a predilection for the posterior body and ramus of the mandible?
odontogenic keatocyst (OKC)
