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Lymph node biopsy is a test in which a lymph node or a piece of a lymph node is removed for examination under a microscope (see: biopsy). The lymphatic system is made up of several lymph nodes connected by lymph vessels. The nodes produce white blood cells (lymphocytes) that fight infections. When an infection is present, the lymph nodes swell, produce more white blood cells, and attempt to trap the organisms that are causing the infection. The lymph nodes also try to trap cancer cells. ==Indications== Lymph node biopsies may be performed to evaluate the spread of cancer. Sentinel lymph node biopsy for evaluating early, thin melanoma has not been shown to improve survival, and for this reason, should not be performed.〔, which cites * * *〕 Patients with melanoma in situ, T1a melanoma or T1b melanoma ≤ 0.5mm have a low risk of cancer spreading to lymph nodes and high 5-year survival rates, so this kind of biopsy is unnecessary.〔 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「lymph node biopsy」の詳細全文を読む スポンサード リンク
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