Abstract
Aim: To determine the interobserver reliability of the Koos classification which is used for grading vestibular schwannomas and to evaluate its correlation with Apperent Diffusion Coefficiency (ADC) and post contrast signal intensity values.
 Methods: Vestibular schwannomas were retrospectively scanned from picture archiving and communication system over a 4-year period. Koos grade of tumor was assessed by two radiologists blinded to the clinical and pathological data. Cohen’s Kappa was used to analyse interobserver agreement of Koos grade. The correlation between ADC, signal intensity measurements and Koos grade of tumors was analysed with Kendall’s tau b correlation coefficient.
 Results: 33 patients (21 females, mean age 52.6±16.6 years) with 34 vestibular schwannomas were included the study. The reliability analyses revealed excellent inter-observer agreement for ADC (ICC: 0.93, 95% CI: 0.87-0.97, p
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