The differential diagnoses of hepatic cystic lesions include simple cysts, parasitic cysts, mucinous cystic neoplasms, congenital cystic dilatation, degenerated metastatic tumors, mucin producing metastatic tumors, cystic hemangioma, lymphangioma, hepatic foregut cyst, and mesenchymal hamartoma and teratoma [5–7]. The gene discussed is MUC5AC; the disease is mesenchymal hamartoma.