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In brief: Water. Free fluid is typically water. The lining of your abdominal contents are slippery (your bowel, the lining of your organs) and it's thus wet inside your abdomen. It's normal to have a little free fluid in one's pelvis, as that's where fluid tends to pool.
What does 'moderate amount of free fluid in the uterine cavity' mean on a CT report? history of pelvic pain and p more What does 'moderate amount of free fluid in the uterine cavity' mean on a CT report? history of pelvic pain and possible cervical mass.