Hello, my grandfather bought meat goulash cubes and when slicing I had our pipe there. It looked like a white vein. Have you ever seen it? I was pretty sick of it. I'm more than you feel. I will never buy goulash.
If it was hollow, then the artery or vein if it was inside the vertebrae so spinal cord. If it wasn't hollow then probably a tendon. Don't worry, none of this is flawed. In any case, I would put it in a stew, it will make you taste it, and if you don't like it, you can take it out.