What it means
The belly is lined by a thin layer called the peritoneum, which also covers most organs. Normally only a little fluid sits in the space between them. Ascites means more fluid has collected there. On ultrasound and CT it shows as dark fluid around the liver, between bowel loops and low in the pelvis. Reports describe the amount and whether the fluid looks clear or holds debris or separate pockets.
When it matters
A trace of fluid can be normal, especially in the pelvis of women who still have periods. Larger amounts usually have a cause that doctors will look for. The most common is liver scarring (cirrhosis). Others include heart failure, kidney disease, infection, inflammation of the pancreas and cancer. Next steps may include blood tests, a heart or liver check, or removing a small fluid sample with a thin needle for testing.
Questions to ask your doctor
- How much fluid is there, and has it changed since my last scan?
- What is the most likely cause of the fluid in my case?
- Should a sample of the fluid be taken and tested?
