The collection of abnormal cells in the brain is termed as a brain tumor. It causes pressure to develop within the skull, which in turn cause damage to the brain. They can be classified as primary or secondary tumors. The primary tumors can be either cancerous or non-cancerous. The primary tumor originates in the brain while secondary tumors spread to the brain from another organ. The secondary tumors are always cancerous in nature. Some of the common symptoms of brain tumors are headaches, confusion, clumsiness and memory loss. They can be diagnosed through physical exam and imaging tests such as CT scan of the head. Tumors are generally treated through surgery. This book includes some of the vital pieces of work being conducted across the world, on various topics related to the diagnosis and treatment of brain tumors. It presents researches and studies performed by experts across the globe. The extensive content of this book provides the readers with a thorough understanding of the subject