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. Here, MUC1 is linked to benign neoplasm.