Brain Tumors ? Brain tumors can occur at any age.? ? The exact cause of brain tumors is not clear? ? Primary tumors are tumors that begin in the brain? ? Malignant: contains cancer cells? ? Benign: do not contain cancer cells? ? Secondary or Metastatic tumors is a cancerous tumor elsewhere in the body that sends cells which end up growing in the brain ? ? Physicians group brain tumors by grade (the way the cells look under a microscope)? ? The higher the grade number, the more abnormal the cells appear? ? the more aggressively the tumor usually behaves.? ? ? Brain tumors are classified as grade I, grade II, or grade III, or grade IV Symptoms? ? Headaches? ? Numbness or tingling in the arms or legs? ? Balance and walking problems? ? Memory problems?