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  • Title: Benign transport of breast epithelium into axillary lymph nodes after biopsy.
    Author: Carter BA, Jensen RA, Simpson JF, Page DL.
    Journal: Am J Clin Pathol; 2000 Feb; 113(2):259-65. PubMed ID: 10664628.
    Abstract:
    The most important prognostic indicator of distant metastasis in breast cancer is histologic documentation of axillary lymph node metastasis. Controversy exists about the importance of micrometastases (< 0.2 cm), and current pathology practice includes a careful search for their presence. We describe the histologic findings in a series of axillary lymph node dissections taken approximately 2 weeks after breast biopsy. Each case has limited presence of epithelial cells in the subcapsular sinus of a draining lymph node that we attribute to mechanical transport of tumor and/or normal breast epithelium secondary to the previous surgical or needle manipulation. These cells were accompanied by hemosiderin-laden macrophages and damaged RBCs. While the clinical implication of these findings is unknown, we believe that it will be of no clinical significance and have no untoward prognostic effect.
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