Ascites is the buildup of fluid in the abdominal cavity. Ascites caused by cancer is called malignant ascites and accounts for 10% of people with ascites. Malignant ascites appears most often in people with breast, colon, gastrointestinal tract (stomach and intestines), ovarian, pancreatic, and uterine cancers.
http://www.cancer.net/patient/All+About+Cancer/Treating+Cancer/Managing+Side+Effects/Fluid+in+the+Abdomen+or+Ascites?et_cid=29219294&et_rid=463566871&linkid=Fluid+in+the+Abdomen+or+Ascites