Daer Sir, at this age we expect in many cases such finding. It indicates that your father has probably fatty liver which is indicator that there is a liver change but it is benign and there is no reason to worry. This is the first(the earliest stage) of liver cirrhosis and causes are alcohol or metabolic syndrome (diabetes, hypertension, obesity and dyslipidemia). He should also check liver enzymes levels, without it I cant tell you the degree of liver fibrosis. So if he have some of the disorders i ve mentioned he should treat these disorders and liver function will recover. does he have any symptoms? Alcohol definitely needs to be forbidden for him. Prostate is another problem, also very common i elderly. Treatment should be planned in consultation with urologist. Wish you good health. Dr. Ivan Romich