简介：Objective:Tofindaneffective,sensitive,specificandnoninvasivediagnosticmethodofbreastcancer.Methods:109massesof102patientswithbreastlesionssmallerthan2cmindiameterweredividedintothreegroupstoundergo99mTc-MIBIimagingandcomparedwiththeresultsofpathologyexamination.20caseswithoutbreastlesionswereselectedascontrol.Abnormalcondensationof99mTc-MIBIinthebreastreaching10%higherthanthatinthecounterpartofthehealthybreastwasregardedaspositive.Results:Of32breastcancers,positiveimagingappearedin25.Negativeimagingwerefoundin31of38benignbreastlesions.Of39occultbreastlesions,positiveimagingappearedin6and3ofthemwerebreastcancer,2of3patientswithslightlyincreased99mTc-MIBIimagingthresholdwerebreastcanceralso.Nopositiveimagingwasfoundinthecontrolgroup.Thediagnosticaccuracy,sensitivity,specificity,positivepredictivevalue,negativepredictivevalueof99mTc-MIBIwas88.4%,89.2%,88.0%,75.0%and95.3%,respectively.Conclusion:99mTc-MIBIimaginghadhighersensitivityandaccuracyinthediagnosisofbreastcanceranddifferentiationbetweenbenignandmalignantbreastlesions.Itcouldprovideusefulinformationforthediagnosisofclinicallysuspectedbreastcancer.