Hepatic fluid-filled sacs may refer to hepatic cysts or liver abscesses in medical terms, which can be related to congenital developmental abnormalities, infections, and other causes.

1. Hepatic cysts: Hepatic cysts are a relatively common benign liver lesion, primarily caused by embryonic developmental disorders, Echinococcus granulosus infection, traumatic factors, inflammatory factors, tumor-related factors, among others, which can lead to symptoms such as abdominal pain and abdominal masses.

2. Liver Abscess: A liver abscess is an infectious disease caused by pathogens invading the liver, primarily including bacterial infections, fungal infections, and Entamoeba histolytica infections. Patients may experience symptoms such as right upper abdominal pain and fever, and sometimes manifestations of liver function impairment may also occur.

Liver cysts may also have other causes. It is recommended to seek medical attention promptly, undergo thorough examinations to clarify the etiology, and receive targeted management or treatment under the guidance of a physician.