Preoperative Diagnosis The patient, a male born in 1969, was 173cm tall and weighed 77kg. In the left lobe of the liver, there is a sort of circular, slightly low-density shadow that is roughly 23mm by 20mm in size, has indistinct borders, considerably uneven enhancement in the arterial phase, weak enhancement in the venous and delayed phases, and is slightly lower density.The doctor suggests percutaneous radiofrequency ablation treatment for cancer.