Objective: To investigate the causes and prevention of the complications of endoscopic sinus surgery (ESS).
Method: We summurized the complications of 26 cases among 100 patients who were performed the ESS operations.
Result: The complications included hemorrhage, cerebrospinal fluid leak, orbital hematoma, subcutaneous orbital emphysema, synechia and antrotomy closure.
Conclusion: We concluded the factors which probably result in complications and the prevention of complications.