Encapsulated seroma

Not as far as I know! My surgeon opened the original mastectomy scar and gave me what he described as as 'a good scrub out' and closed along the same! I healed very fast from the mastectomy and from the second surgery with no complications (apart of course from the seroma after the first surgery!). Problem with a lot of fluid is that it's a nice warm nutritious bath for bacteria (internal ones we all have) and mine had been cooking away for some time. I was also truly over the sloshing noise when I bent over. However, as noted, i had no reconstruction so my mastectomy scar was long but relatively uncomplicated.