Hi Dan I had contrast for initial treatment. After that since just tracking every year I asked for no contrast- with the proviso if they see anything unusual I will return and get contrast. These days the technology is outstanding- my MRI reports are very detailed (I also keep a copy to read on aspects myself with deeper reading and to prepare questions on)- eg the first one I asked for info on the two cysts- turns out they disappeared. This last one in March I asked for them to also look at the trigeminal nerve as I had been getting stabbing pain - all good. Yeah if I were to ever have contrast again I would first have my kidneys checked, would be very hydrated, ask for the lowest dose and then take tiny bit NAC after. Also I would ask for a saline flush. I dont like what I read about contrast as inflammatory and possible accumulation - especially in the context of a AN. I work to keep neuro inflammation in check because I have read that growth is a response sometimes to COX2 expression. Not easy with virusses as it is, stress, poor sleep, environment. Every supplement I take - I google on AN, inflammation etc. I look at studies where I can and am actively involved in my health as I age.