 If you are found to be eligible to participate in the study, you will have an indwelling intrapleural catheter placed. You will have to sign a separate consent document before placement of an indwelling intrapleural catheter can be performed. The pleural fluid will be collected at each clinic visit. The fluid will be saved and analyzed to answer research questions that are part of this study. You will also need to drain your pleural fluid everyday. The research nurse will provide you with instructions on how to drain your daily pleural fluid and a patient diary to take home to record the amount of fluid drained every day. The study doctor or research nurse will review the diary at each clinic visit. 