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Dentigerous cyst1Cyst of the jaw :a. OdontogenicRadicular cystDentigerous cystResidual cystsOdontogenic keratocystb. Non-odontogenic epithelium of tooth-forming tissuesepithelium not involved with tooth formationDentigerous cystBenign odontogenic cysts, associated with crown of permanent unerrupted teethPresent at 2nd to 4th decadeMost important features : Ability to expandDisplace adjacent teeth or boneTrigger : periapical inflammation of adjacent teeth

PathogenesisPressure erupting toothon follicleaccumulation exudatebetween follicular epithelium and crownEncloses crown, attaching to the neckObstruct venous flowClinical presentationPainlessPalpable massDisplace adjacent teeth

Most common location :Mandibular third molarMaxillary third molarMaxillary canine

Imaging modalityOPGCTMRIDentigerous cyst

Figure 1. Circular radiolucencyWell-definedAttached to the tooth at its neckFigure 2 and 3. Dentigerous cystOvoid lucent lesionsWell-definedAround the crowns of unerupted teeth

http://imaging.consult.comradiographics.rsna.orgFigure 4.Ovoid radiolucencyWell defined Thin sclerotic borderAssociated with the crownImpacted third molar

Diagnostic imaging of dentigerous cysts of the mandible, Journal of IMAB, 2008ResumeIntroductionPathogenesisClinical presentationImaging modality and radiographic appearanceQUIZA healthy 25-year-old man came to a dentist with chief complaint of mass in the right jaw, that had been present for several months. This is the image result :Please describe this picture What is the most likely diagnosis?

Odontogenic Lesions Associated with an Impacted Third Molar ToothLesionPathologic FeaturesRadiologic FeaturesDentigerous cystFluid accumulation between crown of an unerupted tooth and follicular epitheliumCrown of an unerupted tooth projects into well-defined cystic lesion; rootsof tooth outside lesionKeratocystic odontogenic tumor Thin, stratified keratinizing squamous epithelium withbasal palisadingMultilocular lucency in periapical; may be multiple; daughter cysts present; may expand and erode cortical bone and cause root resorptionAmelo-blastomaPeripheral palisading and budding, unicysticRanges from expansile, unilocular to multilocular lucency with soft-tissue component; internal septations and soap bubble appearance; may expand into adjacent soft tissue with impercep-tible bone wallAmeloblastoma and Dentigerous Cyst Associated with Impacted Mandibular Third Molar Tooth, 2010, radiographics.rsna.org

Ameloblastomalucent lesion coarse internal trabeculaeMultilocularexpansiledisplacement of teeth and adjacent structures

radiographics.rsna.orgFigure 5a. Lateral oblique radiograph shows an ellipsoid, expansile, multilocular, corticated, lucent lesion occupying the anterior two-thirds of the left ramus with an impacted third molar crown displaced inferiorly within the lesion. The mandibular canal appears to be displaced inferiorly as well

Odontogenic keratocyst Radiographic appearanceLucent lesionsRound or ovoidWell-definedAround the crowns of unerupted teeth