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Liver hypodensity on a CT scan is caused by a variety of factors, according to Radiopaedia, such as benign and malignant neoplasms, focal nodular hyperplasia, focal fatty infiltration, benign epithelial cysts, cysts caused by liver disease and infection, pyogenic abscesses, fungal abscesses, amoebic abscesses, vascular infarctions, lacerations, old ...
Hyper means more and hypo means less, so hypodense means less dense than average. CT scans are literally just shades of grey based on how dense the tissue is when an x-ray tries to travel through it. Air is least dense and is black. Fat and water are hypodense and dark grey. Bone is hyperdense and bright white. The radiologists look at the liver and judge it based on how light or dark grey it is. Hypodense (darker) indicates excess fat in the liver, which means... um... probably exactly what you think it means.