Abstract
In 89 breast cancer lesions found during clinical breast cancer screening with combined usage of mammography (MMG) and ultrasonography (US) between February 1995 and August 2002, we found 13 cases were negative for US detection. In this study, we reexamined those cases of breast cancer undetectable by breast US. In the 12 US-negative lesions, a secondary extended examination performed using US showed 7 lesions were positive for detection; the remaining 5 lesions were still negative for US examination. In summary, of the 89 breast cancer lesions, US failed to detect 10 (11.2%) during clinical breast cancer screening.
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