I've had a catheter put in left lung due to fluid. I've had fluid drained before but now it's coming back after 3 days at about 1200 ml each drain. Why does it come back quicker? I asked my Pulmonary doctor and he could not tell me except to say it's due to my lung cancer. I see my Oncologist next week but I just figured I'd ask one this site first to see if anyone has an answer. The fluid has Adenocarcinoma cells present too but that was the case when I was 4 months between drains in the past. I was told my tumors are stable though from last CT scan. Thanks for any input!