A 35-year-old male was found to be HBsAg(+) 3 years ago with no usual discomfort. To determine the presence of hepatitis B, the patient visited the outpatient clinic. [Hypothetical scenario] Abnormal findings were detected during the outpatient examination, leading to hospitalization. Liver biopsy revealed piecemeal necrosis, destruction of the limiting plate, and passive septum formation. The pathological diagnosis is: