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This systematic review is based on data that has already been published and is not registered as a clinical trial.","order":2,"name":"Ethics","group":{"name":"EthicsHeading","label":"Ethics approval"}},{"value":"Both patients provided written informed consent to participate in this study and agreed to the proposed treatment plan after all options for the management of petrous apex cholesterol granuloma were clearly explained.","order":3,"name":"Ethics","group":{"name":"EthicsHeading","label":"Consent to participate"}},{"value":"All authors have read and approved the final manuscript. Both patients described in this study approved the publication of this study.","order":4,"name":"Ethics","group":{"name":"EthicsHeading","label":"Consent for publication"}},{"value":"not applicable.","order":5,"name":"Ethics","group":{"name":"EthicsHeading","label":"Clinical trial number"}},{"value":"The authors have no competing interests to declare that are relevant to the content of this article.","order":6,"name":"Ethics","group":{"name":"EthicsHeading","label":"Competing interests"}}]}}