A 40-year-old man complains of fever, chills, tachycardia, and pain in the area of his liver. Ultrasound detects a hypoechoic focus with clear contours and homogeneous contents in the right lobe of the liver, against the background of which there is a high-intensity inclusion. The CT scan revealed a round mass with smooth clear contours and a gas bubble in its upper part. Blood tests detect leukocytosis and increased ESR. What is the most likely diagnosis in this case?