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Table 2 Dose parameters and vestibular outcome after SRS, n = 53

From: Vestibular dose correlates with dizziness after radiosurgery for the treatment of vestibular schwannoma

Variable

Valuea

Vestibule doses (Gy)

 Minimum

2.6 (0.05–6.2)

 Mean

6.7 (0.3–10.8)

 Maximum

11 (2–17)

Target volume doses (Gy)

 Minimum

11.3 (6.2–12)

 Mean

12.7 (11.8–17.7)

 Maximum

13 (12.1–23)

Transient volume expansion

18 (34)

Post-SRS tumor necrosis

31 (58)

Patient-reported dizziness

 Stable/improved

40 (75.5)

 Worsened

8 (15)

 No data available

5 (9.5)

Clinical examination

 Spontaneous nystagmus

  Stable/improved

29 (55)

  Worsened

9 (17.5)

  No data available

15 (28.5)

 Romberg test

  Stable/improved

27 (51)

  Worsened

2 (4)

  No data available

24 (45)

 Unterberger test

  Stable/improved

19 (36)

  Worsened

10 (19)

  No data available

24 (45)

Vestibular tests

 Video-oculography

  No spontaneous nystagmus

22 (42)

  Spontaneous nystagmus

3 (5)

  Pathologic smooth pursuit

3 (5)

  No data available

25 (48)

  Stable/improved

24 (45)

  Worsened

2 (4)

 Caloric ips. testing

  Normal (0–25%)

2 (4)

  Mild hypofunction (26–50%)

9 (17.5)

  Moderate hypofunction (51–75%)

3 (5)

  Severe hypofunction (76–100%)

11 (21)

  Percentage caloric weakness (%)

76 (2–100)

  No data available

28 (52.5)

  Stable/improved

12 (23)

  Worsened

13 (24.5)

 cVEMP

  Normal

7 (13)

  Absent reflex

14 (26)

  No data available

32 (60.5)

  Stable/improved

13 (24.5)

  Worsened

2 (4)

  1. cVEMP cervical vestibular evoked myogenic potentials, SRS stereotactic radiosurgery, ips. ipsilateral
  2. aValues are median (range) or number (percentage)