A novel strain of influenza A (H1N1) virus emerged and an outbreak of influenza A (H1N1) occurred worldwide in 2009 and 2010, posing a severe threat to the health of human beings. The two Editors work together in Beijing You An Hospital, to combat this type of influenza. This book, Radiology of Influenza A (H1N1), is intended to provide first-hand clinical data and its scientific analysis, thus supporting sound clinical practice for influenza A (H1N1) prevention and treatment as well as related scientific research.   The authors have collected over 100 critical influenza A (H1N1) virus-infected cases. For cases of influenza A (H1N1) that resulted in death, autopsies were performed for 8 cases after receiving their families' informed consent. Over 200 reports on pathological and histological analysis as well as immunohistochemical and electroscopic analysis were brought together. This book was then compiled by comparing the published data with the present first-hand data.   This book includes a wealth of content, including DR, CT and MRI images, pathological and histological figures, and immunohistochemical and electroscopic figures. Related research, clinical and educational needs can be readily satisfied by its detailed data, texts and figures, as well as typical case reports.   Li Hongjun, is professor and director of the diagnostic radiology department in Beijing You An Hospital, affiliated with Capital Medical University, Beijing, China. Li Ning, is professor and president of Beijing You An Hospital, affiliated with Capital Medical University, Beijing, China.