Background: PPB is a rare cancer of the lung presenting in early childhood, mostly from birth to age ~72 months. PPB occurs within the lung or between the lung and the chest wall. There are three forms of PPB called Types I, II, and III PPB. Children with Type I PPB require surgery and sometimes chemotherapy. Children with Types II and III PPB, require surgery, chemotherapy and sometimes radiation therapy. Because there has never been a consensus as to the best treatment for PPB, the Registry will provide treatment guidelines. It is the goal of the Treatment and Biology Registry that by offering specific regimens the Registry will be able to prospectively review and analyze the regimen for the first time.