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Background Some reports suggest that the rate of definitive diagnosis of malignant tumors, namely, the final diagnosis being revised to a higher stage, in patients diagnosed as having flat epithelial atypia (FEA) by percutaneous needle biopsy of the breast (PNB) is as low as 0–3 %. However, other reports suggest that the rate is as high as 10 % or more, bringing confusion on this issue. We examined...
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