 Results of all subjects audiological and radiologic examinations will be collected at the Department of Cellular and Molecular Medicine, University of Copenhagen. Results will be blinded with regard to ELST history and radiologic results and evaluated by a single senior ear-nose-and-throat specialist, who will look for specific patterns in audiologic parameters over time. Radiologic images will be blinded with regard to symptoms and audiological examination results and will be evaluated by a single radiology specialist, who will look only at the inner ear and surrounding structures for presence of imaging-visible ELSTs and evaluate size and pattern of growth of ELSTs if possible. Audiometric characteristics will be correlated with presence of MRI visible ELSTs and patients subjectively reported audio-vestibular symptoms to determine whether specific patterns of audiological parameters are distinct for ELSTs and their stages of tumor growth. 