When Do You Stop Aspirating Seroma?

I developed a seroma 2 weeks post op TT. I was aspirated 4 times (each aspiration was less than 20cc) and then a seroma catheter was placed. It was in place 10 days and was putting out 15cc on the last 2 days. It was removed on Thursday and on Monday my PS aspirated 5cc. He says he doesn't need to continue to aspirate it any longer. But i can still see the fluid pocket and that concerns me. Because I'm so thin, my PS states this tiny amount of fluid is seen. Aspirate until visual fluid is gone?