Pleural effusion my friend has a adeno lung cancer stage 4 she has completed 6 round of carbo/pem on 26/11/20 her ct scan was on 10/12/20 an she was considered stable an the doctor will stop chemo and to re do the ct in feb he was totally happy with her results. Suddenly one 23/dec she star to cough a lot and to have a shoulder and shoulder blade pain and short breath while working she went to the er and they find pleural effusion and now they have drained 2000 ml so far I wonder how this can happen sudden and did not show in her ct scan in 10 dec how can cancer spread so fast in 2 weeks.