hi my name is Dr Ehsan ullah and I have gone through your query ... you have mentioned about major abdominal surgery and after that you have faced fluid accumulation ... fluid accumulation after surgical Procedure has several causes including Seroma which is collection of clear fluid which leaks from blood vessels after the abdominal and breast surgery etc haematoma which is collection of blood or there may some infective element which leads to pus collection like abscess In either case dealing with such thing takes time and in some cases doctors put patients on just conservative treatment which is basically non surgical approach by using Drugs which other approach is surgical drainage of such such collection followed by serial monitoring via Ultrasound and such drainage may have one or more suasions ... another key aspect in the management of such collection is patient s body immune system which should be strong and patient s general health and diet... you need to keep all these aspects in mind and the more important thing is that you should have clear concept in mind that such things take time to settle ... so don t lose hope and continue the treatment as scheduled ... VAC (vaccume assisted closure )is good as it leads to quick healing ... major abdominal procedure itself takes much time in full recovery as compared to routine procedures... you should continue the treatment regularly ... hope this detail answer your question ... in case you something still not clear then just do let me know ... regards