Fatty liver or steatosis hepatis is a reversible condition seen in chronic alcoholism and many other conditions, where large vacuoles of lipid accumulate in hepatocytes (the cells of the liver).
Accumulation of fat in liver cells will cause the liver to enlarge. The lipid within the vacuoles is a particular type of lipid known as triglyceride. Triglyceride molecules consist of a glyerol backbone with three fatty acid molecules joined on.