Table 4 Operative details

Total endoscopic procedure

136

 1 procedure

39 (51.3%)

 2 procedures

20 (26.3%)

 3 procedures

12 (15.8%)

 4 procedures

4 (5.3%)

 5 procedures

1 (1.3%)

Redo surgery (revision surgery)

37 (48.6%)

 Cyst fenestration of isolated septa

25 (32.8%)

 Revision of the same shunt

5 (6.5%)

 Adding a new shunt

7 (9.2%)

Shunt revision rate per year

0.4

Mean surgical time

2.1 h