Cancers of the brain are the result of abnormal growths of cells in the brain. Brain cancers can come up from primary brain cells, the cells that form other brain components (for example, membranes, blood vessels), or from the growth of cancer cells that grow in other organs and that have spread to the brain by the bloodstream (metastatic brain cancer).
Although many growths in the brain are often called brain tumors, not all brain tumors are cancerous. Cancer is a specific term for malignant tumors. Malignant tumors grow and spread very aggressive. They disturb healthy cells by taking space, blood, and nutrients. Like all cells of the body, tumor cells need blood and nutrients to survive. This is especially a problem in the brain, as the extra growth within the closed limits of the skull can lead to an increase in intracranial pressure or the distortion of surrounding vital structures, causing their malfunction.
