Ectomesenchymal/mixed odontogenic tumour Flashcards
(31 cards)
What are the common clinical features of Odontogenic Fibroma
المكان
الجنس
Common sites mandible premolar /molar
region.
peripheral odontogenic fibroma (POF)
Central odontogenic fibroma (COF)
females
What are the three basic concepts regarding Central Odontogenic Fibroma (COF)مفاهيم أساسية
around crown of unerupted tooth
like dentigerous cys
inactive odontogenic epithelium. طبيعي لانك في اورام ال ct
Fibroblastic neoplasm containing varying
amount of calcified dental tissue
What are the radiographic features of a small Central Odontogenic Fibroma (COF)
الجامع
Calcification composed of cementum like
material or dentinoid material may be
present in some cases
What are the two histological types of Odontogenic Fibroma
Epithelium-poor type (simple type)
II. Epithelium-rich type (WHO or complex
type)
Describe the histology of the Simple type Odontogenic Fibroma.
Mature collagen fibers with abundant
fibroblast in whorled pattern.(نمط حلزوني
Small islands /nests of odontogenic
epitheliu
Describe the histology of the WHO type Odontogenic Fibroma
Mature, fairy cellular fibrous connective tissue
with collagen fibers arranged in interlacing
bundles.
Long strands /islands of abundant inactive
odontogenic epithelium
Calcification of cementum like material may be
present ( Cementifying fibroma
Is Odontogenic Myxoma benign or malignan and derived?
Benign but locally aggressive.
derived from the
mesenchymal portion of the tooth germ
What are the clinical features of Odontogenic Myxoma
الانتشار
المكان
ممكن يتسبب في اي للي حوليه ؟
Non-metastasizing,
mandible molar region
❑ Root resorption.
❑ Tooth mobility.
❑ Bone expansion.
❑ Cortical destruction.
❑ Facial distortion
What is the classic radiographic presentation of Odontogenic Myxoma?
multilocular radiolucency,
consisting of fine trabeculae,
arranged at right angles, known as the‘Tennis-
racquet’ or ‘step-ladder’ سلم بيفتح
Describe the histology of Odontogenic Myxoma
The lesion consists of loosely arranged spindle,
stellate-shape
النسيج بتاعه فضفاض او شكل جيلي ف الجراح صعب انو يشيله
loose,
slippery or gelatinous
معدل الرجوع عالي
From what elements do Cementomas originate
And calcification
Periodontal ligament
Benign cementoblastoma (true cementoma),
Periapical cemental dysplasia, Cementifying fibroma
Florid osseous dysplasia
All solid sheets cellular cementum
(True Cementoma)
* Question: What is Cementoblastoma
Odontogenic neoplasm of cementoblasts
Where does Cementoblastoma
مكان
عمر
mandible in
premolar/molar area (first
permanent molar
children and young adults
How does Cementoblastoma appear radiologically
tumor appears as a radiopaque mass that is
fused to one or more tooth roots and i
surrounded by a thin radiolucent rim.
roots of the is usually
obscured غامض as a result of root resorption and fusion
of the tumor with the tooth
Describe the histopathology of Cementoblastoma
Masses or sheets of hypocellular cementum
reversallines بنشوفها بال Hematoxyphilic
Describe Periapical Cemental Dysplasia.
الانتشار
الجنس / لون الجنس
المكان
rare benign lesion,
❑ Often asymptomatic, related to vital teeth
❑ Most common in black female
❑ Anterior mandible
Periapical Cemental Dysplasia pass through radiologically and histologically
1Early stage (Osteolytic stage)
Fibrous tissue replaces the normal bone tissue (R.L)
II- Intermediate stage
Metaplasic bone and
(cementicles) (Mixed R.L& R.O)
III- Late stage:
• Large sheet of cementum in fibrous stroma (R.O
What are the two benign mixed odontogenic tumors listed
Ameloblastic Fibroma, 2. Odontoma (Compound and Complex
Describe Ameloblastic Fibroma.
العمر
المكان
مكونها
70% in posterior mandible
Young adult and children
Ct and epithelial Bi-phasic tumor,
How do Ameloblastic Fibroma lesions generally appear radiologically
appears as unilocular or
multilocular R.L.
50% of cases associated with impacted tooth
Describe the histology of Ameloblastic Fibroma.
I. Epithelial component
II. Mesenchymal component
III. Dense fibrous capsule
Describe the epithelial component of Ameloblastic Fibroma.
ameloblast like cells and stellate
reticulum-like cells Rosset appearance
strands.
The cords are bi-layered (back-to-back cells)
with an anastomosing growth patternشبكه او فروع
Describe the mesenchymal component of Ameloblastic Fibroma.
Juxta-epithelial hyalinization is dysplastic dentin
or exuberant basal lamina
Ameloblastic Fibro-odontoma/Fibro-dentinoma
similar to ameloblastic fibroma with
inductive changes lead to formation of enamel
and dentin.
Cells in one or more foci continue the
differentiation to form enamel, dentin and
cementum
