Acute and chronic ear disease continues to be one of the leading diseases of childhood. Understanding eustachian tube function and management remains one of the most important aspects in controlling inflammatory ear disease. Chronic ear disease requires elaborate surgical interventions designed to bypass eustachian tube dysfunction and/or poor mastoid aeration, since surgical management of the eustachian tube has been elusive. Our understanding of the ear and hearing continues to expand at record pace, as auditory neuroscientists discover the fundamental molecular structure and function of the auditory system. The cochlear implant has revolutionized the treatment of deafness. In contrast, the complexity of eustachian tube pathophysiology is only just beginning to be appreciated. This book provides a detailed analysis of contemporary knowledge on the morphology, physiology, and gas exchange function of the eustachian tube, middle ear, and mastoid. Newer diagnostic tests, such as sono tubometry, tubomanometry, and endoscopic video-analysis, are also described. Finally, a selection of innovative surgical management strategies for eustachian tube dysfunction is presented. The clinical impact of these diagnostic tools and surgical management options still requires the test of time, as well as investigation by others. This text provides the trainee, clinician, and researcher with the opportunity to acquire state-of-the-art information in a single volume. I am certain that this is just the beginning of our knowledge of ways in which to improve the management of one of the long-standing chronic conditions that result in hearing loss and more serious sequellae.