You know I am but a patent. and not a doctor.
Based on your message of this board,your father had only the left lobe of the liver left. Is it just a solid tumor<3cm or several lesions less than 3cm in size?.
since you just ask questions without providing the CT scan details (ie: location and size and number).I cannot give you the best answer that I can. But if the location are allowed and the size and number is as I stated above;you can have RFA and the newer radiation technology ( ask for a 2nd opinion from an interventional radiologist who is board certifiedfor answer.)
Since the right lobe(the bigger part) of the liver is gone,and if the liver tumor is relatively large in the left. I do not think surgery is the best option RFA or chemoembolizationmay be othr choices . Howeveer, I will NOT do radioembolization because the result comes back from my observation from this board, at least ,is poor(4/4 passed away for the older patient. I truly suspect the low radiation of that procedure have added unwanted side effects to damage further cannotthe overall liver viability and cannot recover like the young patients do.
Please know that my personal opinion is not intended nor implied to be a substitute for professional medical advice. If provided, information are for educational purposes.Consult doctor is a MUST for changing of treatment plans.