Malpas G, et al. - Given that even mild hyperthermia may exacerbate brain injury, researchers performed this retrospective observational study to determine the incidence of mild hyperthermia in craniotomy cases in which the patient was initially normothermic. Study participants were identified from Auckland City Hospital’s database of electronic anaesthetic records. At the end of the procedure, a mildly hyperthermic state was maintained in the majority (77.8%) who became mildly hyperthermic and new mild hyperthermia occurred commonly during craniotomy. Based on the findings, avoiding intraoperative hyperthermia of any degree was recommended and an opportunity for practice improvement in the anaesthetic management of craniotomy patients was suggested, given the compelling evidence of potential harm arising from mild hyperthermia in brain injury.