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BronchogenicCarcinomaBronchogenicCarcinoma(LungCancer)(LungCancer)RespiratorydepartmentDefinitionDefinitionBronchogeniccarcinomareferstothemalignanttumorwhichgrowsinthebronchus.Originatingfrommucusorglandofbronchus.IncidenceandmortalityIncidenceandmortalityBronchogeniccarcinomahasincreasedremarkableinincidenceandmortalityduringhalfofthecenturyandhasbecomethemostfrequentvisceralmalignantdiseasesofmen.Themortalityoflungcancerholdthefirstplaceamongallkindscarcinomas.EtiologyEtiologyThecauseoflungcancerisunknown.Itisbelievedthattherearefollowingrelatedfactors.1.Excessivecigarettesmoking:Smokingindex(BrinkmanIndex)isequaltocigarettesperdaysmokingtime(years).Passivesmokingisalsoacarcinogenfactor.EtiologyEtiology2.Atmosphericpollution.Itwasfoundthatcarcinogenicfactorisbenzpyrene.3.Occupationalfactors.4Radioactivityintheatmosphere.5.DietsandNutrition.6.Chronicirritation.7.Geneticfactors.PathologyAndClassificationPathologyAndClassification1.Accordingtothepositionoftumorarisingfrom,itcanbedividedintotwotypes.Centraltype:Tumorarisesfrommainbronchus,lobarandsegmentalbronchus.Peripheraltype:Tumorarisesbeyondsegmentalbronchus.PathologyAndClassificationPathologyAndClassification2.Accordingtocytology,itisconvenienttoclassifyintofourkindsoftypes.(1).Squamouscellcarcinoma.(2).Smallcellanaplasticcarcinoma.(3).Largecellanaplasticcarcinoma.(4).Adenocarcinoma(includingalveolarcellcarcinoma).PathologyAndClassificationPathologyAndClassificationAccordingtothedifferentprinciplesofmanagement,itisdividedintotwotypes.SCLC:smallcelllungcarcinoma.NSCLC:nonsmallcelllungcarcinoma.ClinicalfeaturesClinicalfeaturesTherearenosymptomsofearlylungcancerinsomepatients.Symptomscausedbylungcancerarenon-specific:perhapsanaudiblewheezeoraslightcough,symptomsofinfection(fever,purulentsputum),ofobstruction(wheezing,dyspnea),orulcerationofbronchialmucosa(hemoptysis).ClinicalfeaturesClinicalfeatures1.Respiratorysymptoms.(1).Cough:(2).Hemoptysis:(3).Dyspnea.:(4).Wheezeorstridor:(5).Chestpain:(6).Fever:ClinicalfeaturesClinicalfeatures2.Symptomscausedbythenearorgansortissueinvolvedbytumor.(1).Dysphagia.(2).Hoarseness.(3).Pleuraleffusionduetoinvasionofthepleura.ClinicalFeaturesClinicalFeatures(4).Horner’ssyndrome.Itiscausedbyinvadingthecervicalsympatheticgangliaontheinvolvedsidethepupilissmallptosisoftheupeyelids,retractionoftheeyeballandnosweatoftheface.(5)CardiaceffusionClinicalfeturesClinicalfetures(6).Superiorvenacavalsyndrome.Duetoobstructionofthesuperiorvenacaval,thepatientmayhavenoticedthathiscollaristight,theneckisenlargedandthejugularveinandtheveinsofanteriorchestwallaredistensionandedemaoftheface.3.Symptomscausedbymetastasis.liver,skeleton,brain,supraclaviclelymphnodes.ClinicalfeturesClinicalfetures4.Paraneoplasticsyndrome.Becausetumorcellcansecreteectopichormone，antigenorenzymethepatientswithLungCancersometimesmayhavesomeparaneoplasticsyndromeIncluding:(1)Collagentissuedisordersuchasfingerclubbing,hypertrophicpulmonrayosteoarthropathy。ClinicalfeaturesClinicalfeatures(2)EndocrinedisordersincludingCushing’ssyndrome,syndromeofinappropriateantiduretichormonesecretion(SIADHS),(3)Neuropathicormyopathicdisordersincludingpolyneuritis,cerebellardegeneration,mentalabnormalitisetc(4)others.RadiographicFindingsRadiographicFindings...