Part of the What Do I Do Now?" series, uses a case-based approach to cover common and important topics in the examination, investigation, and management of central and peripheral demyelinating diseases, vasculitis, and other immune system related neurological disorders. Each chapter provides a discussion of the diagnosis, key points to remember, and selected references for further reading. For this new edition, all cases and references have been updated and new cases have been added, including POEMS, CASPR2 Antibody Syndrome, Isaac's Syndrome, Histiocytosis, and Churg-Strauss. is an engaging collection of thought-provoking cases which clinicians can utilize when they encounter difficult patients. The volume is also a self-assessment tool that tests the reader's ability to answer the question, "What do I do now?"