Liver cysts are sac-like structures found in the liver that can vary in size from 2mm to 20cm. Most liver cysts are asymptomatic but some people may experience abdominal pain, swelling, or discomfort if the cyst is larger than 7cm. Liver cysts are usually detected incidentally during tests done for other health issues and are often confirmed by imaging tests like CT scans or ultrasounds. While small, asymptomatic cysts may not require treatment, antibiotics may be used if a cyst becomes infected or surgical removal may be needed for large cysts causing symptoms or complications.