Liver cirrhosis.

Here's a liver with macronodular cirrhosis being observed in a surgery.
Liver cirrhosis is an end result of an underlying pathology. It develops when scar tissue replaces the normal, healthy tissue of the  liver.
Notice the large nodules separated by wider scars are irregularly distributed throughout the liver, which occurs  usually due to an infectious agent such as viral hepatitis which does not diffuse uniformly throughout the liver.
Usually, such liver damage cannot be reversed, but treatment can delay further progression and reduce complications.
Liver transplantation is necessary when complications develop and liver cease to function.