I would ask the surgeon if he is able to isolate the suspect lymph node. I had a needle biopsy of one under my arm and the results were meh. Then, scheduled for an excisional biopsy and the surgeon said he would likely take out others as well as, due to size of the node, it might not be visible. Give your guy the articles you find: here's one: https://www.sciencedirect.com/science/article/pii/S1476558604800411