الفهرس 
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Abstract
Introduction:
Cerebrospinal fluid (CSF) rhinorrhea is defined as the leakage of CSF from the nose due to breakdown of the barriers separating the nasal cavities from the subarachnoid spaces: skull base, dura mater and arachnoid membrane. The causes of CSF rhinorrhea are classified into traumatic either accidental or iatrogenic (during endoscopic sinus surgery) and non traumatic (congenital, spontaneous, or secondary to tumour invasion of the skull base).
Approximately 3% of closed head injuries, 30% of all skull base fractures and less than 1% of endoscopic sinus surgery result in CSF rhinorrhea.
Non traumatic CSF rhinorrhea accounts for only 3%-4% of cases.The non traumatic fistulas are further classified into high pressure or normal pressure. Because of the serious potential complications of CSF rhinorrhea, (meningitis, brain abcess, pneumocephalus) prompt management and repair of all CSF rhinorrhea should be attempted. Different approaches have been described for the repair of sinonasal CSF fistulas, including the intracranial approach, which has high failure rate up to 70%. Multiple extracranial approaches have been used to repair CSF leak. The most important approach for repairaiting CSF leaks is the endoscopic approach reporting an initial success rate of 88% with afinal success rate of 100%.
Aim of Work:This work aims to individualize the technique of endoscopic management of CSF rhinorrhea according to the site of leak and evaluate the outcome of each technique.