Table 2.
SDD and SDD (%) for measurements performed on T1-weighted, contrast-enhanced (CE T1-WI) images and T2-weighted images.
| CC | CC | AP | AP | ML | ML | VOL | VOL | |
|---|---|---|---|---|---|---|---|---|
| SDD (mm) | SDD (%) | SDD (mm) | SDD (%) | SDD (mm) | SDD (%) | SDD (cm3) | SDD (%) | |
| T1 A–D (n = 68) | 2.98 | 40.3 | 2.23 | 28.3 | 2.12 | 20.9 | 0.11 | 19.7 |
| T2 A–D (n = 68) | 2.76 | 40.1 | 2.69 | 34.3 | 2.69 | 30.52 | 0.14 | 30.1 |
| T1 A (n = 29) | 2.41 | 52.8 | 1.49 | 28.0 | 1.96 | 27.1 | 0.05 | 28.9 |
| T1 B (n = 27) | 3.23 | 34.5 | 2.53 | 26.5 | 2.33 | 17.8 | 0.06 | 10.4 |
| T1 C (n = 6) | 3.60 | 32.7 | 3.05 | 28.7 | 2.49 | 14.9 | 0.07 | 8.70 |
| T1 D (n = 6) | 2.96 | 18.8 | 2.90 | 23.7 | 1.08 | 5.00 | 0.26 | 5.70 |
The SDD and SDD(%) for CE T1-WI are subdivided according to vestibular schwannoma (VS) stage: A intracanalicular VS, B VS extending into the cerebellopontine angle, C VS compressing brain stem, D VS deviating the fourth ventricle
SDD smallest detectable difference, SDD (%) smallest detectable difference relative to baseline measurements, CC craniocaudal dimension, AP anteroposterior dimension, ML mediolateral dimension, VOL volume