The higher the grade of a tumor, the more malignant it is. A physician with special training and experience in analyzing microscopic changes in brain and related tissues. This physician provides follow-up care after treatment. Any mass or growth of abnormal cells occurring in the brain tissue, skull, supportive tissue around the brain, cranial nerves, or the pituitary or pineal gland can be a brain tumor. Primary brain tumors Primary tumors may be malignant or nonmalignant.
Malignant tumors contain cancer cells.
High-grade malignant tumors grow rapidly and invade healthy tissue around them. These tumors eventually crowd out or destroy the normal cells and interfere with their function. Low grade tumors are less malignant and tend to grow more slowly. These tumors may coexist with normal cells. However, they can invade surrounding tissue causing severe neurologic impairment, such as seizures, behavioral changes and memory loss.