Hi, I have this lump on the back of my neck (right in the middle of the back0 for about 5 years. It seems to get bigger every year. It is about 2 inc. length wise. It is not visible unless I lean my head backward then I can feel it in between my middle and index fingers if I press them on the area.. It feels hard but it does not seem to stay at the same place like if I bend my head forward then it disappear and I won't feel the lump. I've seen by my primary doctor and even a neck specialist and they sent me for a neck x-ray, an ultrasound, and a cat scan but all came back negative. The docs think that maybe I have a "thickened' muscle or tendon ....What else should I do ??? This lump does not cause pain or hurt when touched but it is so annoying whenever I remember it. I'm afraid I might have cancer. Pls advise. thank you.