Hi and welcome to HCM.
What symtpoms your dad have? It is hard to say the exact reason. He should do further tests. Liver
enzymes, blood tests and CT scan
is the condition which can be caused by many infections toxicity, hepatic tumours, or metabolic disorders. Also biliary obstruction,viral hepatitis
or alcohol are possible causes.
His liver morphology seems normal,only mild enlargement is described. If he dosent experience any difficulties he should only follow hepatic diet and do frequent check ups.
Wish you good health.