Figure 1.

(a) The distribution of glioblastoma multiforme (GBM) and brain metastasis (bMET): all GBM are located in the supratentorial and there is no infratentorial GBM in our study. bMET is more predisposed to scatter in the field of middle artery supply. (b) Primary sources of bMET: lung cancer (51.5%) is the most common bMET in our study. The rest are colorectal cancer (29.0%), breast cancer (6.5%) and kidney cancer (6.5%). 2 (6.5%) cases are undefined cancer (also called cancer of unknown primary), which have a definite brain tumour pathology of carcinoma, but the origin of the cancer could not be found even through positron emission tomography/CT scanning.