Maastricht University

___ pN1a: Metastases in 1 to 3 axillary lymph nodes, at least 1 metastasis greater than 2.0 mm ___ pN2a: Metastases in 4 to 9 axillary lymph nodes (at least 1 tumor deposit greater than 2.0 mm) ... If a nonpalpable lesion is detected by mammography, ultrasound, or magnetic resonance imaging (MRI), a wire is placed to identify the location of ... ................
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