The professional term for abdominal fluid is called peritoneal fluid, and has a relatively diverse clinical etiology, such as portal hypertension in the decompensated phase of cirrhosis, or exudative changes in the peritoneal cavity caused by inflammation, tumor, surgery, or trauma. The imaging manifestation is a watery band-like hyperdense shadow around the liver margin, below the diaphragm, and around the colon. When patients undergo CT examination in the horizontal position, imaging changes similar in density to fluid in the bladder and gallbladder can be seen in low-lying locations in the body such as the hepatic and renal crypts, the paracolic sulcus or the pelvic utero-rectal fossa.