Well, I'll tell you my experience with the ct guided drains that I had put in for my abscess that was the size of my surgeon's fist. I had it placed, and about
a week or so later went back and it was gone according to the ct scan so they pulled the drain. I was back at the hospital a couple of weeks later because the abscess had filled up again. So they put the drain back in and left it in for a month this time. I went back and they pulled it. Off and on for about
8 months the spot where the drain went in would drain fluid on it's own.
Until, one day, I woke up and I could hardly walk and I was in so much pain. I went to the er, it was the weekend and my surgeon was not on call. That turned out to be a huge blessing (he was the one who stood at the end of my hospital bed and told me that this is how they drain abscesses now with the ct guided drainage). So, I got the colo rectal surgeon on call, and he was awesome and still is my surgeon to this day! He was trained at Cleveland Clinic. He told me that any abscess that is drained by the ct guided drainage with the drain left in is only gonna come back eventually because you are leaving some of the bacteria behind and it multiplies and fills up again...and that is exactly what mine did twice.
He said that you need to have the abscess drained in an operating room, so they open the abscesses up, drain it, clean it, and leave it open to heal from the inside out. They then insert an anoscope and put dye in the abscess and see if they can see it on the inside and find a fistula. This finally got rid of my abscess. I hope I haven't discouraged you, but I wish I had someone to tell me what I know now.