What does micrometastases mean in relation to melanoma?

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PeterBeitschMD (Physician - Surgery - Surgical Oncology (Verified) ) - 03 / 23 / 2012

An average lymph node is about 1/2 an inch in length (1.2 cm). The vast majority of 'positive' lymph nodes (those with spread of the melanoma from the skin to the lymph node(s)) in our era are 'micrometastatic' - that is deposits < 2 millimeters in size.
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