Two cases of early breast cancer were incidentally detected by FDG-PET among 585 examiners in our hospital. One case was primary breast cancer in an asymptomatic individual and the other was second primary cancer in a patient with ovarian cancer. The size of each of the tumors was approximate 1 cm in diameter. The maximal standard uptake value of the lesions was 1.5 and 2.4, respectively, which was below the cutoff value (2.5) commonly used for excluding malignancy. Key words: breast cancer, FDG-PET Ann Nucl Med Sci 2005;18:241-245 Breast cancer has been the 4th leading cause of female cancer death in Taiwan. The average lifetime risk of breast cancer in an American woman is one in seven . Randomized trials have shown that screening the general population by mammography reduced mortality associated with breast cancer by at least 24 percent and cancer was detected in 5 to 7 of every 1000 women on the first screening mammogram 
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