Article Figures & Data
Figures
- Fig 1.
Types of AICA loops. A, Type I AICA loops lie within the CPA (arrow) but do not enter the IAC. B, Type II AICA loops enter the IAC (arrow) but do not extend into >50% of the length of the IAC. C, Type III AICA loops extend into >50% of the IAC (arrow).
- Fig 2.
Neurovascular contact types between the AICA and the cochleovestibular nerve. A, A type I neurovascular contact shows no neurovascular contact (arrow). B, A type II neurovascular contact shows contact (arrow) between the AICA and the cochleovestibular nerve without angulation/indentation of the nerve. C, A type III neurovascular contact shows angulation/indentation (arrow) of the cochleovestibular nerve by the AICA loop.
Tables
MRI findings according to patient groups
Type Group 1 (n = 16) Group 2 (n = 14) Group 3 (n = 16) P Values AICA I 7 (43.8%) 7 (50.0%) 13 (81.3%) II 7 (43.8%) 6 (42.9%) 2 (12.5%) III 2 (12.5%) 1 (7.1%) 1 (6.3%) .803a/.158b/.065c Neurovascular contact I 5 (31.3%) 8 (57.1%) 10 (62.5%) II 8 (50.0%) 6 (42.9%) 6 (37.5%) III 3 (18.8%) 0 (0%) 0 (0%) .130a/.769b/.032c,d ↵a P values indicate the results of statistical comparisons between groups 1 and 2 by the Wilcoxon signed rank test.
↵b P values indicate the results of statistical comparisons between groups 2 and 3 by the linear association test.
↵c P values indicate the results of statistical comparisons between groups 1 and 3 by the linear association test.
↵d P values < .05.
