Brain tumour. Coloured scanning electron micrograph (SEM) of a glioma, a type of tumour that arises from glial cells of the central nervous system. The most common site for gliomas is the brain. They can be either low or high-grade, with the latter having the worse prognosis. Magnification: x8000 when printed at 10 centimetres wide.    Credit: STEVE GSCHMEISSNER Types Of Tumors, Scanning Electron Microscope, Microscopes, Microscopic Photography, Micro Photography, Microscopic Images, Fotografia Macro, Macro And Micro, Brain Tumor