BDA is an extremely rare benign tumor, which is difficult to distinguish BDA from hepatocellular carcinoma through imaging examination .Its main character of pathological is a large quantity of proliferated bile ducts, which can be observed in the lesion,They are CK7, CK19, and EMA immunoreactive, and are p53 and Ki67 negative. The gene discussed is MUC1; the disease is hepatocellular carcinoma.