Hi B & C,
If you have an appointment with Dr. Walsh then you will be meeting with one of the top ranked urologists in the world. I'm guessing that you live in the Baltimore-Washington DC area, and if that is the case you're very fortunate to have access to so many excellent doctors and hospitals. While you are there at Hopkins you may want to speak with Dr. Epstein as well.
Good luck to you on the 4th,