Sounds like level IV, V or even VI. I assume it's on the right? Do you know it's a metasteses. Level V, VI is unusual, but it happens, and there can be skip metastases or only area left for metastases to go after the MRND, and move downward in the chain. Other type cancers can go up to this area also. I had three neck dissection in the area but the last two wound up not being a lymph node. It was free or roaming cancer, which is not good. Fortunately, surgery was always the easiest part of treatment for me, but with prior surgery, treatment, it is more difficult. Radiation dosage may be limited to the toxicity level of the brachial plexus, nerve, and other structures. Several treatment cancers only wanted to do 50 Gy for the recurrence, but I went with high dose IORT, with another doctor, which included another RND, and radiation similar to brachytherapy, at 15Gy directly on the tumor during surgery, which protects vital structures, and additional chemo and radiation at 50Gy 6 weeks later. He said just doing 50Gy, Chemo would not work, and cancer would likely return. You may want to get other opinions also. Good luck.