Tumors can be malignant or benign.
A benign tumor
is one that does not grow rapidly, does not infiltrate normal tissue, and does not metastasize or break off and spread to other parts of the body. However, in the brain a benign tumor can be malignant by position. If the tumor is located deep or in a very sensitive place, it can be very dangerous. Some brain tumors can just be easily cured.