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We aimed to examine the effect of surgical volume on the 1-year mortality of patients who underwent craniotomy for brain tumor removal. In this nationwide population-based cohort study, data were extracted from the South Korean National Inpatient Database. The study included patients diagnosed with brain tumors who underwent craniotomy for brain tumor removal between January 1, 2010 and December 31, 2018. Multivariable Cox regression models were used to evaluate the associations between surgical volume and outcomes. A total of 9,849 patie