الفهرس 
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Abstract
ACKNOWLEDGEMENT
I would like to express may deep gratitude to professor
Dr. Mamdouh El Gouhary, Professor of Oto-Rhino-Laryngol.
ogy, Aln-Shams University, tor l1is kind guidance, construetivc
cri.ticisn1, and continous enco11ragement during the preparation
of this study, with much patience and enthusiasm. All
tl1is study was carried under his continous supervision and
participation . 1 am definitely indebated to him more than
I can expr(•ss.
would also like to 0xpress mc~y deepest CJratiludc
to assisstant professor Dr. Mohame<l Khalil, assisstant
profebsor of nto-Rhino-Lurynyology, Ain-Shams unive>r.sity,
for his guidance, continous help, and great stlpport .
Last, but not least, I would like to express may ’
deepest gratitude and thanks to all may professors, teachers
and colleagues without their aid, I would have been unable
to undertake this work .