P L. Dhingra Dhingra - Diseases of Ear, Nose and Throat

Diseases of Ear, Nose and Throat
&
Head and Neck Surgery SEVENTH EDITION

PL DHINGRA, MS, DLO, MNAMS, FIMSA

Emeritus Consultant, lndraprastha Apollo Hospital, New Delhi
Formerly Director, Professor & Head, Department of Otolaryngology and Head & Neck Surgery, Maulana Azad Medical College and Associated LNJP & GB Pant Hospitals, New Delhi

SHRUTI DHINGRA, MS (MAMC), DNB, MNAMS

Member, International Medical Sciences Academy; Fellow, Laryngology and Voice Disorders; Head of Department of Otolaryngology and Head & Neck Surgery, ESIC Medical College, Faridabad, Haryana

Assisted by

DEEKSHA DHINGRA, MD, PGDHA, MPH (UNIVERSITY of SYDNEY) and Vibhatsu

ELSEVIER

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Diseases of Ear, Nose and Throat & Head and Neck Surgery, 7th Edition, PL Dhingra, Shruti Dhingra and Deeksha Dhingra

Copyright 2018 by RELX India Pvt. Ltd. (formerly known as Reed Elsevier India Pvt. Ltd)

Previous editions 2014, 2010, 2007, 2004, 1998, 1992.

Reprinted 2016 (Twice), 2015, 2014, 2013, 2012, 2011 (Twice).

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ISBN: 978-81-312-4884-3

e-Book ISBN: 978-81-312-4939-0

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Dedicated to all my students: past, present and future who are the inspiring force behind this work.

I reproduce below the invocation from our great ancient scripturethe Kathopanishad which shows the relationship between the teacher and the taught.

O God, the almighty, bless us both (the teacher and the student) together, develop us both together, give us strength together. Let the knowledge acquired by us be bright and illuminant, and second to none. Let both of us live together with love, affection and harmony. O God, let there be physical, mental and spiritual peace.

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It is a matter of pride and pleasure to bring out the silver jubilee edition of our book Diseases of Ear, Nose and Throat & Head and Neck Surgery. The book was first published in 1992 and has been well accepted and appreciated by the students and teachers all over the country as well as in adjoining South Asian countries. During this period of 25 years, six editions and several reprints were brought out. This was the result of growth of the speciality, innovations in technology and surgical techniques but behind it was students burning desire to know the subject and quest for knowledge. They freely interacted through emails, letters and other types of social media to clarify, and send suggestions, omissions, commissions, and their interest in the subject to further add the topics of their need. We complied practically with all of them as far as possible.

Our basic aim in writing this book has been to build concepts in disorders of ENT, superstructured with the students earlier knowledge of anatomy and physiology learnt in previous professionals. Since Otolaryngology, commonly called ENT, is a full-fledged subject in MBBS examination and is so recognized in various universities in India and Medical Council of India, we did not lose sight of the fact that students have to clear the exams too. The book covers disorders of ENT, surgical instruments, imaging techniques, operative surgery, recent and newer modalities of treatment in a concise, lucid and studentfriendly manner. The chapter on Nuggets for Rapid Review covers most of the questions that are often set in post-graduate entrance and Diplomat of National Board (DNB) examinations.

The present edition is revised, updated and expanded. Several new clinical photographs, diagrams, tables and flowcharts have been added to make the subject clear. A unique feature of this edition is white board lectures and videos ( ), depicting through animations, the surgical