This book provides a comprehensive overview of state-of-the-art imaging in infectious and inflammatory diseases in head and neck. It starts with a brief introduction of infectious diseases in head and neck, including normal anatomy, classification, and laboratory diagnostic methods. In separate parts of eye, ear, nose, pharynx, larynx, and maxillofacial region, the common imaging techniques and imaging anatomy is firstly introduced, and then typical infectious and inflammatory diseases is presented with clinical cases. Each disease is clearly illustrated with PET and MR images and key diagnostic points. The book provides a valuable reference source for radiologists and doctors working in the area of infectious and inflammatory diseases.