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Table 4 Grading and comparisons of the signal intensity of the perilymph (n = 42)

From: Signal and morphological changes in the endolymph of patients with vestibular schwannoma on non-contrast 3D FLAIR at 3 Tesla

  PPI (n = 42)
Grading of signal intensity Comparisons of signal intensity between affected and unaffected sides
Perilymph Affected side Mean (SD) Unaffected side Mean (SD) AC1 value (95% CI) Affected side AC1 value (95% CI) Unaffected side p value (Wilcoxon signed-rank test) Higher signal on the affected side Equal signal Higher signal on the unaffected side AC1 value (95% CI)
Basal turn of CD 1.69 (0.64) 0.07 (0.26) 0.92 (0.83–1.02) 0.98 (0.96–1.00)  < .0001 38 4 0 0.97 (0.84–1.00)
Middle/apical turn of CD 1.67 (0.69) 0 0.93 (0.85–1.02) 1.00 (1.00–1.00)  < .0001 37 5 0 0.97 (0.93–1.00)
Vestibule 1.67 (0.69) 0.02 (0.15) 0.98 (0.95–1.01) 0.99 (0.98–1.01)  < .0001 37 4 1 0.94 (0.87–1.01)
Anterior SCC 1.41 (0.81) 0 0.75 (0.60–0.90) 1.00 (1.00–1.00)  < .0001 34 8 0 0.98 (0.96–1.01)
Lateral SCC 1.36 (0.79) 0 0.75 (0.60–0.90) 1.00 (1.00–1.00)  < .0001 33 9 0 0.99 (0.97–1.01)
Posterior SCC 1.45 (0.77) 0 0.86 (0.77–0.95) 0.99 (0.98–1.01)  < .0001 35 7 0 0.99 (0.97–1.01)
Overall mean 1.45 0.02     36 6 0  
  1. PPI positive perilymphatic images, SD standard deviation, CI confidence interval, CD cochlear duct, SCC semicircular canal
  2. Signal intensity was graded as follows: 0 = similar to that of CSF in the cerebellopontine angle cistern (normal signal), 1 = higher than that of CSF without sharply delineated borders, and 2 = markedly higher than that of CSF with sharply delineated borders