The skull base is at a crossroads. It is a meeting point for anatomical regions, surgical specialties, and surgical philosophies. Skull base surgery is a dynamic subspecialty and the last decade has witnessed the application of endoscopic techniques to the ventral skull base using an endonasal corridor. The transition from external approaches to an endonasal corridor has not been without controversy. In this volume, we explore the nascent field of neurorhinology, a term that emphasizes the multidisciplinary collaboration between neurosurgeons and rhinologic head and neck surgeons. A wide variety of topics are covered, demonstrating the breadth of skull base surgery. Neurorhinology has been separated into two volumes, the first volume broadly on the common pathologies encountered and the second volume on more complex lesions. There is a contribution by endocrinologists and radiation oncologists in each issue, respectively. Skill acquisition and training is addressed in the second volume. We confront the controversies head on, asking the authors to apply evidence-based medicine techniques to critically evaluate the literature and attempt to answer some of the most important clinical questions. We include here portions of the Oxford Centre Evidence-based medicine levels of evidence that were used throughout every discussion (Tables 1 and 2). We further hope that the questions raised here will identify areas in need of better data and stimulate new investigations. As always, we wish to acknowledge our spouses and families, whose support has been an integral part of our careers.