brain tumour
noun [ C ] UK (US brain tumor) uk/ˈbreɪn ˌtʃuː.mər/ us/ˈbreɪn ˌtuː.mɚ/
脑肿瘤，脑瘤
an abnormal growth of tissue in the brain or spinal canal that may be benign (= not likely to cause death) or malignant (= likely to cause death if not treated)