Table 1 The different risk of skull base injury using TMS classification.

From: A new radiological classification for the risk assessment of anterior skull base injury in endoscopic sinus surgery

Type*

Right

n (%)

Left

n (%)

Total

n (%)

Risk of skull base injury

1

132 (44)

134 (44.7)

266 (88.7)

Low

2

3 (1)

2 (0.6)

5 (1.6)

Moderate

3

15 (5)

14 (4.7)

29 (9.7)

High

Total

150

150

300

 
  1. *Type 1 is both OF-CP and OF-ER are longer than 10 mm, Type 2 is when either OF-CP or OF-ER is less than 10 mm, Type 3 is both OF-CP and OF-ER are less than 10 mm.
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