My father is suffering from periampulary cariconoma and metallic stent placed in bile duct after one week he has got fever what are cause. pls guide?

Many causes: There are many potential causes of fever in this setting. Certainly it is important for his doctors to be sure that the stent is draining the bile adequately. If your father is at home, be sure his doctors are aware of his fevers. otherwise, be on the lookout for any others symptoms which may give a clue as to the cause of the fevers. Good luck.