Brain tumours are referred so based on the type of cell that they form in and also where the tumour had first formed in the central nervous system. It may be easy to tell the different between slow-growing and fast-growing types of tumour from the grade of a tumour. The different stages of cancer or grades of brain cancer are differentiated based on how abnormal they look under a microscope and also how quickly they grow and spread.
According to the WHO grading system, here is how brain tumour manifests in different stages of adult brain cancer.
Read more articles on Adult Brain Cancer.