Hi, Janice.
Welcome to the Forum
I had retrosigmoid a little over 3 years ago for an AN that was approximately 3 cm - not at Johns Hopkins, but in Illinois where I live. I had very slight facial nerve issues for 24-48 hours post op, but that was the end of it, thankfully. I also ended up SSD because my tumor was wrapped around my hearing nerve and in order to remove it entirely my docs had to "kill" the nerve. I've worn a BAHA for the past 2+ years and am VERY happy with it.
Everybody's experience is different though, so my outcome really has no bearing on yours.
I've heard of Drs. Tamargo and Niparo through this Forum and from what I've heard they are very well qualified and very experienced. IMO you'd be in good hands under their care.
Did you discuss radiation with them? From the size of your AN it should be an option, although location is also important.
If Drs. Tamargo and Niparo don't do radiation, I'd suggest that you consult with a doctor (or doctors) who do. Docs who only do surgery, tend to recommend surgery and docs who only do radiation, tend to recommend radiation. So, you definitely want to consult with someone who does both.
Last, but not least, you should contact the ANA for their informational brochures. They are a great resource and answer a lot of questions about ANs.
Best,
Jan