I think I may have told you this when you first mentioned the lump..but my OH had a lump in his arm...oh 16 years or so ago now, on the outside of his arm and mixed in with the muscle. He was told at the hospital that if it was cancer his arm would have to come off at the shoulder, as they would damage the muscles so badly trying to remove the lump that it would be useless. Anyway..it wasn't cancer (thank the gods) and they took out as much as they could without having to touch the muscles. They had to leave some behind, but it has never grown back. Even after a biopsy, they didn't have a clue what it was, just that it wasn't cancer...they said the nearest thing they could say was it looked as if he'd injected himself with a grease gun he hadn't, I hasten to add. I hope Sheena comes out of it intact, but if not, well three legs are better than no life