الفهرس 
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Abstract
First and foremost I always feel deeply grateful to Allah Most Gracious Most Merciful for helping me completing this work.
I am profoundly indebted to Prof. Dr. Nagy M. Iskander, Professor of Otorhinolaryngology, Suez Canal University, for his kind supervision and guidance being mostly supportive and extremely helpful.
I would like to express my deepest gratitude and appreciation to Prof. Dr. Mohammed H Badr Eldin, Professor of Otorhinolaryngology, Suez Canal University, for his great scientific help and continuous encouragement to complete this work.