Pleased to present this book about the value of Magnetic Resonance Imaging (MRI) versus Ulrasonography (US) in evaluation of fetal chest. All gratitude and respect goes to my professors in Radio-diagnosis department Cairo University prof.dr Dorria Salem, prof.dr Sohaa Talaat and prof.dr Noha Beheiry for their continuous guide and support. Hope the reader finds this book useful ,informative and interesting as well .