Small traces of fluid on lungs after chemotherapy?

Hi there,

My Dad has undergone Chemotherapy for Lung cancer. There were two cancers overall (one on each lung). One of the lungs was affected around 1/3rd and the second cancer was a very small growth.

He went through all of the tests and confirmed that the cancer hadn't spread at all to the lymph nodes and went ahead with the Chemo treatment. The treatment has finished it's cycle and the Dr was happy to report that both cancers had shrank by more than half and therefore they would proceed onto radiotherapy in order 'tackle them both while they're on the run'.

On the lead up to Radiotherapy, he had an xray in order to prep for the treatment, however he was randomly asked to come into the hospital a week before the radiotherapy was due to begin. Apparently, the xray has found a very small amount of fluid on both lungs and there was something else present. Due to this, the radiotreatment has been cancelled as the potential risk wasn't deemed worth it. Now he has to wait 2-3 months as the current amount is too small to extract a sample from. In the meantime due to also suffering from COPD, he is making appointments with his Dr's to have a new assessment on this as well.

I just wish to ask; is it common for Chemotherapy to cause fluid on the lungs? Is this not a good sign at all? His lymph nodes were clear before the treatment had started, and throughout the entire treatment no fluid was detected until the treatment had finished. Is this a sign that it's spread even more, or just an uncommon side effect?

  • Hello thegenuineluke and thanks for posting, 

    I am sorry to learn about your dad and can understand you having questions about his treatment.

    I don't know what these small traces of fluid are. When doctors talk about fluid on the lungs, they usually mean something called a pleural effusion but your dad's doctors might mean something else. A pleural effusion is when fluid collects between the sheets of tissue that cover the outside of the lung and the lining of the chest cavity. These sheets of tissue are called the pleura. If there is enough fluid to restrict the lung from expanding properly and cause breathlessness, then it can be drained off. 

    Pleural effusions can occur for several reasons including cancer and infection. Chemotherapy doesn't usually cause pleural effusions, but it can increase the risk of infections, and can also have other effects on the lung. However if someone has a known lung cancer and a pleural effusion it is likely that they would both be linked, but I don't know what your dad's doctors are thinking. You mentioned that it will be some time before there is enough fluid to drain and extract a sample so perhaps the doctors are planning to do this later. 

    I'm afraid I can't tell you if this fluid is a bad sign just because I am not involved in your dad's care so I don't know. With your dad's permission, I think the best thing to do is to talk to his hospital team and ask them when this fluid means. If he has a lung nurse they may be the easiest person to contact. 

    I am sorry not to be more helpful. Do give us a ring if you want to talk anything over. The number to call is Freephone 0808 800 4040 and we are here weekdays, 9-5.

    Best Wishes,

    Julia