الفهرس 
Review of LiteratureOnly 14 pages are availabe for public view
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Abstract
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SUMMARY AND CONCLUSION
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Recent and rapidly advancing tHchniques for the clinical
evaluation of the intranasal and puranasal sinuses anatomy
and pathology are based on the abL ity to directly visual ize
normal structures and pathologic val-iations using a series of
small nasal endoscopes which provide direct visualization
with brilliant illumination of intranasal structures. So.
chronic sinusitis and nasal polyposis can be managed with
high success for alleviation of symptoms and improvement of
disease with negligible morbidity, Nasal endoscopes has its
limitations even with the aid of 2.7 rom endoscope which
include inability to discern disefLse within the constricted
and narrow area in the asal cavity. There are also some blind
areas to nasal endoscopes. The anatomic variations. trauma
represent structural variation t he.t. makes examination by
nasal endoscopes difficult to be conlpleted.
The introduction of computed tomography in the diagnosis
of the nose and paranasal sinuses is considered as a revolution.
Computed tomography pr-ovLdes the best information
regarding the nose and paranasal sinuses themselves as well
as a broader demonstration of the functional anatomy and anatomic
variation. The CT scan given us a mechanism for accurately
defining and staging the extE,nt of the diseases.
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It has already been established that nasal endoscopy and
compllt.edtomography are complementary tools to adequately
evaluate the nasal and sinus diseases. Although, computed
tomography is high able to identify deeper pathology not
detected by nasal endoscopy. it is rather expensive, with
relative high exposure dose and time consuming.
To reduce time, cost and radiation. Chow and Mafec
(1989) descrihed the screening coronal CT scan. and White et
al. (1991) described the modified CT mini series.
CT is well agreed upon as a preoperative investigation
prior functional endoscopic sinus surgery as it is important
addition to nasal endoscopy. It is indicated in patients with
extensive pathology. It gives important information as suspecting
the nature of the lesion. It is also indicated in
recurrent cases after conventional surgery. Adhesions and
bleeding may hinder proper endoscopic examination.
We found that computed tomography should also be done in
cases of minimal pathology detected by nasal endoscopy which
does not alone Justify endoscopic sinus surgery to identify
hidden deeper pathology. This was true in 8 cases (i.e. 32%)
when endoscopic sinus surgery was found to be necessary.
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We advocate to do CT in cases with difficult examination
endoscopically. CT was important as in addition to correction
of these anatomical variation. deeper pathology was identifiable
and dealt with at the same sitting.
We also advocate to do CT in cases with no pathology
detected endoscopically although these patients were still
complaining of symptoms suggestive of chronic sinusitis CT
was found to define whom of these patients is a candidate for
sinus surgery which was true in 3 cases (i.e. 12%).
CT should be done in cases of persistent symptoms
following endoscopic sinus surgery.