Paraneoplastic syndromes, defined in this book as disorders caused by cancer, but not a direct result of cancer invasion of the affected organ or tissue , once believed to be rare and esoteric neurologic disorders have assumed increasing importance as an explanation of neurologic and other symptoms in patients suffered from occult or controllable cancers. This book attempts a comprehensive review of paraneoplastic syndromes from considering both clinical and pathophysiologic aspects. The book is divided into 4 sections: The first is an overview, classifying the disorders, describing a clinical approach to the diagnosis and treatment of paraneoplastic syndromes in general and identifying their pathogenesis. The section discusses the clinical findings and treatment of individual paraneoplastic syndromes with chapters dedicated to each of the neurologic syndromes and a chapter discussing nonneurologic syndromes such as endocrine, cutaneous, and rheumatologic paraneoplastic disorders. The third section discusses autoantibodies that characterize individual paraneoplastic syndromes. The final section discusses the paraneoplastic syndromes associated with individual cancers.