Diagnosis of BCA was complicated by the presence of wide variety of cystic lesions in the liver, including simple cysts, parasitic cysts, degenerated metastatic tumours, mucin-producing metastatic tumours, congenital cystic dilatations, cystic hemangioma, lymphangioma, hepatic foregut cysts, mesenchymal hamartoma, and teratoma [5, 13–15]. This evidence concerns the gene MUC5AC and metastatic neoplasm.