Pitting Edema

My wife Dawn has had some problems with edema since her resection in January. It has begun to subside considerably. Her legs are almost back to normal but she still has some in the abdomen.
She is a kidney transplant patient as well as this diagnosis of Chlangiocarcinoma, so I am not sure what combination of factors may be contributing to the problem. Try searching pitting edema on this link for medical terms (http://www.medicinenet.com/). Hope this helps.