question: My husband was dx june 2010 with stage 4 nsclc. No spread to brain liver or any other vital organ but multiple lymph node involvment. He did have 2 1/2 liters of fluid removed at dx a year ago and talc was used then.  My question is now he has began to have lower leg pitting edema. I requested doplar to rule out blood clots and that came back negative. What could be the cause of the edema and is CHF a concern if the fluid is present in lower extremities?