简介：Metastasisoflungcancertothetemporalboneisaveryrarediseaseandsubjectivetinnitusasthepresent-ingsymptominthesepatientsisevenrarer.Herewereportacaseinwhicha42-year-oldmalepresentedwithsubjectivetinnitusofthreemonths,withnopulmonarydiseasesymptoms.Puretoneaudiometryindi-catedmoderateconductivedeafnessinleftearwithanair-bonegapof21.3dB.HRCTtemporalbonescan-ningindicatedhigh-densityshadowsintheleftepitympaniccavity,sinustympaniandmastoidcavity.Chron-icotitismediawithcholesteatomawassuspectedandsurgicaltreatmentrecommended.However,preopera-tivechestx-rayrevealedhigh-densitymilletlesionsscatteredwidelyinbothlungs.HRCTlungscanningconfirmedthelungslesionsandindicatedlungcancer.Inordertodeterminecorrelationsbetweenthetempo-ralboneandpulmonarylesions,aCT-guidedtrans-mastoidaspirationbiopsyandimmunohistochemicalstudywereconducted,whichconfirmedthatthetemporalbonelesionwasmetastaticfromthelungs.Thepa-tientwasgivenaseriesofchemotherapyimmediatelyandhistinnitussignificantlyimprovedafterthreemonthsoftreatment,withfullrecoveryofhishearingandcompleteresolutionofshadowsinthemastoidcavity.Unfortunately,hesubsequentlydevelopedmultiplebonemetastasesinthe9thmonthandcerebralmetastasisinthe18thmonth.Multipleorganfailureresultedindeathin2.5years.