A brain tumor is a collection, or mass, of abnormal cells in the brain. The cell grows into a tumor when a cell divides rapidly and its internal mechanism is damaged. A brain tumor can be primary or secondary depending upon its place of origin. A primary brain tumor begins in the brain while a secondary tumor starts elsewhere in the body and sends cancerous cells to the brain, causing secondary or metastatic brain tumor. Brain tumors can be either malignant (with cancer cells) or benign (without cancer cells).


