What Is a Brain Tumor?A tumor is any mass caused by abnormal or uncontrolled growth of cells. Tumors in the brain are categorized according to several factors, including where they're located, the type of cells involved, and how quickly they're growing.Medical terms doctors may use to describe brain tumors include:Primary vs. secondary: Primary brain tumors originate in the brain. Secondary brain tumors are made up of cells that have spread (metastasized) to the brain from somewhere else in the body. In children, most brain tumors are primary. The opposite is true in adults.Benign vs. malignant: Benign tumors are slow-growing, noncancerous, and...
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