I've had the worst luck with this. I've been on IVs since October of last year and they aren't working. I'm on cefoxitin and tigecycline for this infection. It makes me feel really crummy. I hate to be the bearer of bad news, and this may not actually be everyone's case, but I've been told you can't get rid of it, you can only knock it back a bit. I was REALLY sick with it in 2008 (the fevers were unbelievable), then I got better. Off and on last year though, I kept getting fevers and general ickiness. My culture showed M. abscessus and has ever since. I've had only two CT scans and I don't think either really showed anything. I'm not sure, I think they just showed lung damage...but certainly not in any way to tell if it was caused by the mycobacterium or just CF progression. My CF doc isn't too keen with having CT scans done, especially multiple/frequent ones, due to the radiation exposure.
Do you have any symptoms with it? I've met CFers that culture it and their CF docs don't treat it because they don't have sort of side effects or symptoms (like fevers or night sweats). From what I understand, these people don't have any real trouble with it. Unfortunately, I'm the exact opposite. I get fevers frequently, both low and high grade, and I'm always tired and worn out...just to name a few.
Do you see an infectious disease doctor or just your regular CF doc? This past october was when my CF doc called an infectious disease doctor. She is the one who prescribed the IVs I'm on now and my CF doc is just sort of overseeing it. If you're really concerned or really sick with it, I would recommend seeing an infectious disease doctor.
I hope you have better luck with treating this bug than I do! PM me if you have other questions, I'd be happy to answer if I can!