Tumors and cancers are insidious diseases characterized by an abnormal growth of cells that extend beyond their usual boundaries and disrupt the normal functions of affected organs. Forming the first of the four volumes devoted to tumors and cancers, this volume focuses on the central and peripheral nervous systems. Each chapter presents a state of the art summary of tumor/cancer of a particular type in relation to its definition, biology, epidemiology, disease mechanism/pathogenesis, clinical signs, diagnosis, treatment and prognosis.