A tumor in the brain is a mass of some abnormal cells. This mass can be malignant or benign. Malignant tumors are cancerous and benign tumors are non-cancerous. Primary brain tumors originate in the brain; these form in the brain tissues. Secondary brain tumors originate in other parts of the body and spread to the brain. Usually malignant tumors become secondary tumors which form when cancer spreads from other parts of the body. 
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