Harry, actually it was partly after reading of your experience that I decided to adopt a 'wait and see' approach.
The turtle in question emerged from hibernation without any visible problems and a healthy appetite.
I suspect that the infection never became caseated: she did do a little more basking than some of the others.
A little background here, too. A couple of years ago, a different turtle had started to show swelling at the end of summer: I took him to the vet who performed the usual surgery, but who remarked that the matter he removed was not of the a'usual' consistancy (ie: not caseated). In fact, I ended up taking the turtle back for a second procedure a few monthes later. As a result of this experience, I had decided that I'd consider waiting if the situation arose again, to avoid subjecting anyone to unnessary procedures.
Two turtles developed swelling this year in mid spring, and, since both were eating well and had normal activity levels, I opted to wait. They're both females who produced two clutches each, too, and I was very aware of this in contemplating timing of any surgery.
One case resolved itself, the other didn't, and required lancing when she exhibited signs of discomfort and difficulty eating. She actually did alot more basking.
Both are doing fine at this point.
You really do have to "know your pets", though, so this is not an approach that would be right for everyone.
Stephanie