الفهرس 
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Abstract
CRS is a chronic disease that characterized by inflammation of the mucosa of the nose and paranasal sinuses of at least 12 consecutive weeks duration.
- Current treatment options for patients with CRS range from medical therapy in the form of antibiotics, antihistamines, corticosteroids to surgical intervention in the form of FESS.
- Balloon dilation by BCS is promising in that it may allow dilation of an isolated obstructed ostium without extensive dissection and it may also be helpful in protecting nasal physiology that is often scarred by FESS in addition the balloon catheters can be successfully guided into the sphenoid, frontal, and maxillary sinuses.
Reported complications associated with the device involved penetration of the lamina papyracea and intraorbital complications of pain, ecchymosis, erythema and CSF leak in addition to the cost associated with the procedure and its failure to remove tissue and bone for complete disease clearance, especially as in the setting of sino-nasal polyposis or ethmoidal/infundibular disease of nasal cavity.
The Aim of study is to assess the feasibility and safety of the balloon catheter dilatation technique in treatment of CRS using systematic review where:
1 -We search the literature.
2 -We critically analyzed the retrieved articles.
3 -We found no RCT for reasons were mentioned in the discussion part of the search, only one case control study and 17 case series studies.
-The best available level of evidence for the safety and feasibility of the BCS according to CEMB standards as shown in table 3 in comparison to FESS was level 3b as shown in the study (Wynn and Vaughan, 2006) and labeled 1 in table 4.
- Lesser level of evidence was level 4 in 17 case series studies as shown in table 4 and labeled from 2 to 18.
- Recommendation: in order to raise the level of evidence for the feasibility and safety of the BCS in comparison to FESS researches should aim to design and conduct in form of cohort studies more than 80% follow up to reach level 1b level of evidence or better using RCT to reach level 1a.