From there we can go on to discuss the types of treatments available. Because of the Internet there is a wide spread of information. The line between benign and malignant tumor seems to be over lapping. Malignant tumors as a rule contain Cancer cells. Sometime what would be considered benign will sometimes become so invasive that they are considered malignant.
Tumor are graded but only after a biopsy.
About the only thing known about cause of brain tumor is that you don t catch them. Some time certain occupation experience higher incidences of brain tumors. There is two types of tumor ones that occur in the brain its self , others that migrate to the brain from other parts of the body. So if lung cancer moves to the brain the cells will still be lung cancer cells. Symptoms sometime come on slowly.