I am a 1 1/2 yr breast cancer survivor - had DCIS, lumpectomy and 33 treatments of radiation. About 6 months ago (at the 1 year mark), I got this "chord" that runs from my breast, through my armpit and into my bicep. It is uncomfortable and at times painful if I reach my arm over my head. I was told by a PA (physicians assistant) that I ran into on the breast cancer walk that it is called chording. It is getting worse. I am going to my surgeon for a follow up visit in a few weeks and hope to get a better answer.