odontogenic tumours

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ODONTOGENIC TUMOURS:

ODONTOGENIC TUMOURS ADENOMATOID ODONTOGENIC TUMOUR CALCIFYING EPITHELIAL ODONTOGENIC TUMOUR SQUAMOUS ODONTOENIC TUMOUR

Classification :

Classification Tumors of odontogenic epithelium ameloblsatoma malignant ameloblastoma amelblastic carcinoma clear cell odontogenic epithelium adenomatoid odonto genic tumors calcifying epithelium odontogenic epitheliuum Squamous odontogenic tumor

ADENOMATOID ODONTOGENIC TUMOR,:

ADENOMATOID ODONTOGENIC TUMOR,

AOT:

AOT A well circumscribed lesion derived from odontogenic epithelium Usually occurs around crowns of unerupted anterior teeth Of young patients Consists of epithelium in swirls and ductal patterns interspread with spherical calcification.

AOT :

AOT Origin from reduced enamel epithelium of the post secretory phase of enamel organ. Confirmed by ultrastructural and histochemical studies. Initially was designated as variant of ameloblastoma as adenoameloblastoma Some consider it to be hamartoma Now considered as epithelial odontogenic tumour with an inductive effect

Clinical features:

Clinical features Age young pts 2/3 in between 10 to 19 yr. Site.anterior jaw twice as often in maxilla than mandible. Sex. female as twice than maxilla Presentation intra bony may be associated with unerupted teeth some time extraosseous Small asymptomatic large cause painless swelling

radiographically:

radiographically 75 % cases radiolucency involve crown of uneruted tooth usually canine DD from dentigerous cyst Located b/w roots of teeth as well delineated radiolucency May have snowflake radiolucency

histopathology:

histopathology On gross capsulated central portion solid or may show cystic degeneration M/C Spindle shaped cell in sheets strands Amorphous or crystalline calcifications and microcysts lined by ameloblast like cells

Treatment :

Treatment Enucleation No aggressive behaviour

CEOT:

CEOT A locally aggressive tumor consisting of strands and medullary patterns of squamous and clear cells that are often accompanied by spherical calcification and amyloid staining hyaline deposits

Calcifying epithelium OT:

Calcifying epithelium OT Also called Pindborg tumor Rare but imp due to resemblance to poorly differentiated carcinoma !% of OT 200 cases reported Histogenesis not certain but thought to be stellate reticulum or dental lamina rests

CEOT CL FEATURES:

CEOT CL FEATURES Presentation intraosseou or extra osseous Age 20 to 60 mean 40 Mandible posterior region Slowly growing asymptomatic swelling

radiographically:

radiographically Diffuse radiolucency with faint flecks of calcified structure snow shower Intraosseos usually associated with uneruted or displaced teeth Margins scalloped multilocular or honeycomb or monolocular

histopathology:

histopathology Sheets of variable cells with well defined cell mem and prominent intercellular bridges Nuclei pleomorhic, large hyper chromatic resembling carcinoma or smaller and more uniform Calcification and amyloid like material leisgang rings

treatment:

treatment b/c of local invasion and without capsule radical margins as ameloblastoma

Squamous odontogenic tumour:

Squamous odontogenic tumour benign but occasionally aggressive epithelial odontogenic tumor first in1975 by Pullon et al Wide age distribution peak in 3 rd decade 2;1 male predilection More maxilla and anterior more than posterior

Sq.odontogenic:

Sq.odontogenic typical radiographic appearance is that of a triangular or semicircular radiolucency with the narrow part of the lesion toward the alveolar crest, often with a radiodense border, and located within the alveolar process between the roots of teeth.1–4 Root resorption has been described.

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numerous, variably sized and shaped, sometimes anastomosing islands of stratified squamous epithelium. oval to polygonal nonkeratinized cells surrounded by flattened, round, or focally cuboidal basaloid cells

treatment:

treatment Curretage with excision

thanks:

thanks