I had melanoma of the left leg, mole..I had operation jan 7 20l5 to remove the sentinel node. after having a pet scan there were no more visible melanoma nodes..I need to make a decision on having all my lymph nodes removed in the left groin area and take the chance of lymphedema, or have utra sound every 4 months to see if any other ones show up for three years at the cancer center. there is a 80 percent no more cancer and 20 percent possiblity of unnoticed cells not seen on pet scan. My cancer doctor is good with either decision I make. im very active hiker, gardener , and love the out doors daily, lymphedema at 73 could end my quilty of life. I feel ultra sound might be the way to go at this stage of the game, coments