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.
- breast cancer