This book serves as a guide to the pulmonary and critical care complications of hematopoietic stem cell transplantation (HSCT). HSCT is an important therapeutic modality for a variety of malignant and non-malignant conditions. The outcomes of these patients have been improving and the number of HSCT cases is increasing around the world. These patients, however, continue to have post-transplant complications related to conditioning regimens and graft vs. host disease. Pulmonary complications following HSCT remain a major cause of morbidity and mortality in this patient population.