Just scar tissue

I've had an odd bump, lump on my arm for about 10 years. I've had it looked at 3 different times by 3 different doctors, all 3 saying its scar tissue. The last one even told me it would never turn in to cancer.
About 6 mons ago it started to grow, a lot. Hubby, family and friends kept saying I needed to get it checked again. Well, I'm busy. Training for races, hanging out with my grandkids, taking the parents to doctor appointments and planning a 3 1/2 week vacation. I'll have it checked after the vacation, I told everyone.
Went to see my GP in September, still saying its scar tissue and removing it maybe considered cosmetic surgery, he referred me to Brad the PA in the surgery center.  Thank you Brad the PA for doubting it was scar tissue. After a biopsy, it came back as a rare sarcoma. Sarcomas usually grow inside you, they like soft tissue. Not arms, not tissue on the outside of your body!
Now I go see Dr. T a general surgeon, he enters to the room with my file and states "boy, are you healthy! Except for that on your arm."  He had been doing some research on how to remove my lump. There is nothing written up on what I have. No paper, no article. Nothing. He is going to check with a MOHs specialist and see what he says. A week later I get a call from Dr T and the MOHs specialist doesn't know what to do with it either. Great!
We decide that he will remove it under general anesthesia at the hospital. My lump is about the size of a quarter but the cut will be much bigger so he can get clean margins. And the incision will be about 5 inches long so he can close it. And there will be a scar, a big scar. Great...
Surgery day comes and I'm scheduled to check in at 1pm. No eating from midnight the night before and no fluids after 11am. Long day to say the least. Hubby and I head out for the hospital, my parents and mother in law want to come and sit with hubby during my procedure. I kept referring to them as his geriatric posse!  I'm funny!
Needless to say, everything went well. I thought it was going to be a simple recuperation but no. No driving for 2 days, then slowly ease back into my normal activities. Really? I'm fine...three days after surgery I went out with my girl child to run some errands, came home and napped for 2 hrs!
So don't let things like this go, I received an email from my GP saying he was so happy that I was persistent about getting it removed. Also received an email saying that the 2nd biopsy came back clear. Yeah!  Just need a chest X-ray to make sure there is no cancer growing there...where it usually likes to grow.