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Hello, Welcome to Just Answer and thanks for your question. FDG stands for 2-[18F] fluoro-2-deoxy-D-glucose. It is the tracer used during PET scans to make abnormalities more visible.
It means that the node picked up excess amounts of the tracer. It isn't a diagnosis, but it is suspicious of a metastasis. Your physician will possibly want to do a biopsy.