<s>[INST] My mother tells me that a lung doctor has told her he wants to insert a stent in her lung to help with fluid. I am thinking she is confused. I am several hours away and still haven t been able to contact doctor. Is this is something that can actually been done? She is 81 with congestive heart failure and moderate kidney failure. [/INST] Hello dear, thanks for your question on Chat Doctor. I can understand your situation and problem. Old age patients with congestive cardiac failure (CCF) and moderate kidney failure tend to retain fluid due to poor pumping of heart and poor excretion of fluids through kidneys. So fluid tends to accumulate in the body. These excess fluid retain in dependent part of the body like lower limbs, abdomen and lungs. Excess fluid in the lungs in known as pulmonary edema and this can trouble patients with cough and breathlessness. So these excess fluid must be removed from the body. So pigtail catheter is used for this. It is tiny, hollow rubber tube inserted in the chest (stent like thing) for the removal of excess fluid. So the treating doctor is mostly explained about pigtail catheter to your mother. </s>