The thoroughly updated Twelfth Edition of this classic retains the organization, practicality, and readability that makes "Merritt's Neurology" one of the most popular texts among neurologists, primary care physicians, and residents reviewing for psychiatry or neurology boards. In 183 short chapters, the book provides the essentials clinicians need on symptoms/signs, diagnostic tests, and neurologic disorders of all etiologies. For this edition, Timothy A. Pedley, MD, Chair of the Department of Neurology at Columbia University, joins Dr. Rowland as co-editor. Coverage includes separate chapters on autism, autosomal recessive ataxias, and autosomal dominant ataxias, and new chapters on endovascular neuroradiology, parkinsonian syndromes, Lewy body dementias, frontotemporal dementia, vanishing white matter, vasculitis, normal pressure hydrocephalus, neuromyelitis optica, Kennedy disease, spinal muscular atrophy, complex regional pain syndrome, disorders of DNA translation, the immune restoration inflammatory syndrome IRIS, and Hashimoto encephalopathy. Most chapters have been updated to reflect advances in molecular genetics. There is a companion Website that will offer the fully searchable text and an image bank.