Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. A group of abnormal cells in the brain is known as a primary brain tumor. However, the term “brain tumor” includes all types of tumors that are located in the cranium or in the central spinal canal, therefore, the term also refers to metastatic brain tumors. Brain tumors can be benign and malignant, the presence of cancer cells distinguishes cancerous tumors from non-cancerous forms. However, both forms of brain tumors may cause serious health problems. Learn more about the disease, its causes, symptoms and treatments in this book.