Table 3.

Intraclass correlation coefficients (ICC) for two-dimensional and volume measurements on T1-weighted, contrast-enhanced images (CE T1-WI) and T2-weighted images with their 95% confidence intervals.

	CC	AP	ML	VOL
T1 A–D	0.947 (0.915–0.967)	0.974 (0.957–0.984)	0.978 (0.965–0.987)	0.999 (0.999–1.000)
T2 A–D	0.943 (0.909–0.965)	0.961 (0.938–0.976)	0.948 (0.917–0.968)	0.999 (0.998–0.999)
T1A (n = 29)	0.564 (0.260–0.768)	0.862 (0.729–0.932)	0.947 (0.892–0.975)	0.987 (0.973–0.994)
T1B (n = 27)	0.674 (0.393–0.841)	0.802 (0.604–0.907)	0.889 (0.767–0.949)	0.988 (0.973–0.994)
T1C (n = 6)	0.840 (0.315–0.975)	0.917 (0.588–0.988)	0.968 (0.822–0.995)	0.999 (0.993–1.000)
T1D (n = 6)	0.966 (0.810–0.995)	0.980 (0.883–0.997)	0.990 (0.942–0.999)	0.999 (0.992–1.000)

ICC values for CE T1-WI are subdivided per VS stage: A intracanalicular VS, B VS extending into the cerebellopontine angle, C VS compressing brain stem, D VS deviating the fourth ventricle

CC craniocaudal dimension, AP anteroposterior dimension, ML mediolateral dimension, VOL volume