There are other possibilities. I had a mass measuring 7.3cm x 6cm and the ER doc told me with great certainty (based on a CT scan) that I had lung cancer. It took quite a while for them to figure out what was wrong but it turned out not to be cancer, instead it was a really bad infection.
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See the links below to the Summary of Safety and Effectiveness and product labeling for more complete information on this product, its indications for use, and the basis for FDA's approval. Product Name: Genesis Neuromodulation (IPG) System Manufacturer: Advanced Neuromodulation Sysytems (ANS), Inc.