I have squamous cell carcinoma on the right side of my neck. They could not find my primary through the scans and biopsies either. In March I had a 7.5-hour surgery. They found it. It was very small spot on the back of my tongue. They removed it and 27 lymph nodes and 4 were cancerous, my tonsils, and several teeth. I finished radiation the end of May. My Dr. said that it wouldn't just go away.