Pathological examination of sentinel lymph node in breast cancer: potential problems and possible solutions.

Sentinel lymph node (SLN) biopsy has emerged during the last few years as a viable option for staging the axilla in the treatment of breast carcinoma. This procedure can potentially identify patients who would be helped by full axillary lymph node dissection (the SLN-positive cases), and those who would not (the SLN-negative cases). Review of the literature confirms the promise of SLN; however, the possible problems in the pathological handling of SLN, including the microscopic misinterpretation of benign structures and "spurious" immunohistochemical staining, need wider recognition.