To validate a predictive model for the risk of receiving RBCs in this population. This model uses four preoperative values (haemoglobin levels, tumour volume, previous craniotomy in the same spot, and number of craniotomies foreseen). The investigators would like to create an online data collection tool and calculator.
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Number of red cell concentrate transfused
Timeframe: During the surgery
Number of red cell concentrate transfused
Timeframe: Immediately (first 24 hours) after the surgery