Hepatomegaly 18. 8 cm with diffuse fatty

54F,ht-5 feet 1 inch,wt-62kgs,BMI-26.I had lap chole 4 months ago.I had 2 gallbladder attack.At that time Dr found 2 big gallstones.I had 16000 wbc with 86% neutrophils and 12% lymphocytes.USG found 2 big gallstones & hepatomegaly 18.8 cm with diffuse fatty changes.No  focal lesions are seen.There is no intra/extrahepatic dilation biliary radicals.Other organs were normal size & no ascites.I did LFT,amylase,lipase,GGT,hepatitis B & C,HIV,CXR-all normal.In blood test i have normal hemoglobin & platelets.Only WBC is high.P-time was normal & ESR was 19.After lap chole Drs sent the gallbladder for biopsy.Biopsy was benign,it mentioned both chronic & acute cholecysticis.Drs told me that the leukocytosis is due to some gallbladder infection & inflammation.I have taken advice of another doctor.Both the gastro surgeon & the next doctor have not prescribed any medicine for hepatomegaly.My query is what is the cause of 18.8 cm liver.I have seen on Internet that normal liver size is 15 or 16 cm.