The result of 45 years' study of pediatric laryngology, phoniatrics, and bronchology, this book helps readers understand the nature of pathological sound originating in the respiratory tract and detect the characteristic symptoms of different diseases, including airway obstruction, neurologic abnormalities, and chromosomal derangements. Unusual airway sounds from a child may furnish important diagnostic clues. Therefore, careful analysis can be an important and sometimes vital aspect of the physical examination.