Data collection and statistical analysis
We retrospectively evaluated patient charts, operation protocols and pathological reports. Relevant data were collected: gender, age, location of BCA (Robbin’s neck-level and side), tonsillectomy yes/no, histopathological differentiation, duration of follow up and recurrence of BCA. Nominal scale data was described with frequency, ratio scale data over median and standard deviation. We performed a purely descriptive data analysis using the software IBM SPSS Statistics 26.