Hi, Becknell:
I can understand the anxiety even the slightest sign of a re-growth can generate. Still, we have to be realistic and acknowledge that whether we undergo microsurgery or radiation (or even both) and although it may be a remote possibility, re-growth
can occur, sometimes years later. 1 mm is pretty inconsequential...unless the AN being checked is yours. That being noted, I can see why you and your husband are upset and seeking reassurance.
Frankly, I think that
Steve has already offered the best reassurance there is, based on the demonstrable fact that MRI scans
do have a slight margin of error, which could very well explain the 1 mm difference in your husband's latest scan. My suggestion is to simply go on with your lives as usual but with the realization that your husband's AN could,
maybe,
possibly re-grow and have to be treated in the future...but perhaps not. I suspect that radiation, possibly FSR, might be used for a future treatment.
While your concern is quite normal, there is no real need to allow a 1 mm difference in an MRI scan to color your lives for the next year. The odds are heavily in favor of you and your husband truly having left acoustic neuromas behind...for good. I don't think I'm being overly optimistic when I state that until you both know for an absolute medical certainty that the AN is re-growing, I would refuse to be any more concerned than your doctor apparently is, which is hardly at all.
Jim