Does anyone know what a dense liver means once they use a sonogram and what could it be causing it?

I had to get an ultrasound and an MRI to diagnose gallstones and on the report it said I had a dense liver. I had my gallbladder removed when I was 17 and the doc never said anything about being concerned with my dense liver. I've looked it up on the internet and all I can find is stuff about alcoholism and some pretty serious diseases. If your doc isn't too concerned with it, it may just be a fatty liver. Dense livers can be caused by a lot of different things so ask your doctor about possible causes in your case.