Koos Classification of Vestibular Schwannomas: A Reliability Study

Neurosurgery
Nicholas J EricksonWinfield S Fisher

Abstract

The Koos classification of vestibular schwannomas is designed to stratify tumors based on extrameatal extension and compression of the brainstem. While this classification system is widely reported in the literature, to date no study has assessed its reliability. To assess the intra- and inter-rater reliability of the Koos classification system. After institutional review board approval was obtained, a cross-sectional group of the Magnetic Resonance imagings of 40 patients with vestibular schwannomas varying in size comprised the study sample. Four raters were selected to assign a Koos grade to 50 total scans. Inter- and intrarater reliability were calculated and reported using Fleiss' kappa, Kendall's W, and Intraclass correlation coefficient (ICC). Inter-rater reliability was found to be substantial when measured using Fleiss' kappa (.71), extremely strong using Kendall's W (.92), and excellent as calculated by ICC (.88).Intrarater reliability was perfect for 3 out of 4 raters as assessed using weighted kappa, Kendall's W and ICC, with the intrarater agreement for the fourth rater measured as extremely high. We have demonstrated that the Koos classification system for vestibular schwannoma is a reliable method for tumor class...Continue Reading

References

Jun 1, 1992·Journal of Neurosurgery·G FischerJ Rémond
Feb 17, 1998·Statistics in Medicine·S D WalterA Donner
Dec 7, 2010·Journal of Clinical Epidemiology·Jan KottnerDavid L Streiner
Sep 3, 2014·Neurosurgery·Amjad N AnaiziPhilip V Theodosopoulos

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Citations

Aug 22, 2020·Curēus·Alejandro L FeriaDaryoush Tavanaiepour
Oct 6, 2020·Frontiers in Neurology·Samuel EarlyKonstantina M Stankovic
Jul 29, 2020·Clinical Neuroradiology·Wenjianlong ZhouWang Jia
Nov 26, 2020·Clinical Nuclear Medicine·Karim AmraneRonan Abgral
Dec 4, 2020·The Laryngoscope·Pierre-Cyril ComesMichel Kalamarides
Apr 17, 2021·Neurosurgery·Nicholas J EricksonWinfield S Fisher
May 5, 2021·European Archives of Oto-rhino-laryngology : Official Journal of the European Federation of Oto-Rhino-Laryngological Societies (EUFOS) : Affiliated with the German Society for Oto-Rhino-Laryngology - Head and Neck Surgery·Olivier PlainfosséThierry Mom
Jun 23, 2021·Zhurnal voprosy neĭrokhirurgii imeni N. N. Burdenko·G Yu GrigoryanYu A Grigoryan
Nov 1, 2021·World Neurosurgery·Travis J AtchleyWinfield S Fisher

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