<qa>  What is the purpose of this study?The purpose of this study is to determine the best treatment for children with a fluid collection in the chest associated with an underlying pneumonia. Researchers generally agree that a child with a large fluid collection in the chest need to have the fluid drained in addition to anitbiotics. There have been many treatments studied in children that have been shown to be effective and safe, but the treatments have never been compared to each other in a randomized controlled study. 