I was thinking specifically of the CDC. The American Cancer society is across the street, and Emory about a quarter mile up Clifton. But that's more epidemiology than surgery.
Dallas is a larger city than Atlanta, and in case you've forgotten, this sub-thread began with you doubting DeBakey's greatness because he chose to practice there.
The point you seem to be missing is that it is institutions, not cities, that create centers of medical learning. In addition to Atlanta, Dallas and Rochester, you'll find top-ranked medical centers in Durham, Nashville, Cleveland, Ann Arbor and Palo Alto, for starters.
Scratch Dallas. Make that Houston. (I had a brain spasm and tried to put him on the main Baylor campus).