In this work I endeavour to explain the morphological changes in diseases of the human ear, nose, larynx and pharynx. Efficient ENT practice, like that in other surgical specialties, relies on close collaboration between surgeon and pathologist through the medium of biopsies. Accordingly much of the present volume emphasizes diagnostic surgical pathology. The role of the pathologist is, however, a broader one-in otolaryngology as in other specialties-contributing as well to an understanding of the disease processes. For this pur pose autopsy study is important and nowhere more so than in the disease of the inner ear, an area which has been developed mainly by otologists, but neglected by pathologists. It is hoped that, by displaying the interest and potential for development of such fields, this book may stimulate some pathologists to work in them. I kept in mind while writing the possibility that it might also be useful to ENT clinicians as a review of the pathology of their specialty.