A questioned-based review of hyperkinetic movement disorders of childhood with emphasis on Tics (primary and 2ndary) and Tourette syndrome as well as stereotypies (as important differential diagnosis of Autism Spectrum Disorder) including Rett Syndrome (X-linked Dominant developmental regression) followed by a brief discussion of important differentials of Chorea, Myoclonus and Dystonia Subjects are important for USMLE Steps 1,2, 3