This book provides both basic and advanced information on the clinical presentation, imaging findings and treatment of sinonasal diseases. For each specific disease, the rationale underlying the treatment strategy is discussed and the imaging findings critical to the decision-making process are identified. This is an original approach and reflects the constant team effort at the editors' institute over the past 15 years to integrate clinical and radiological information with the aim of establishing the most appropriate treatment. Special emphasis is placed on the identification of clinical and imaging data that allow selection of an endonasal or an external approach in surgical candidates. The value of planning an integrated endoscopic and radiological follow-up in the different diseases is also thoroughly reviewed. Through the correlation of imaging with endoscopic or clinical findings, this book will enable radiologists to familiarise themselves with the "otorhinolaryngological world" and clinicians to understand more fully the significance of specific radiological findings. It will serve as an invaluable guide to the selection of imaging techniques.