The authors review their experience with endoscopic repair of skull base defects associated with cerebrospinal fluid (CSF) rhinorrhea involving the paranasal sinuses. A total of22 patients was treated endoscopically between 1992 and 1998. The repair method consisted of closure of the CSF fistula with a free autologous abdominal fat graft and fibrin glue, supported with a sheet of silastic. The management of cerebrospinal fluid (CSF) leaks has been a controversial topic from many points of view. The accurate localization of a CSF fistula presenting as rhinorrhea is an essential requirement for successfil dural repair. Although the diagnosis of the CSF fistula is not a difficult task, the precise localization and surgical closure are much more difficult, depending mostly on its etiology and on the size of the osteodural defect. Craniofacial trauma is still the main cause of CSF rhinorrhea, representing 75% of cases. The relatively high morbidity and failure rate of an in-

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