itive skin picking or scratching associated with amphetamine intoxi cation or abuse (e.g.,
patients are diagnosed with substance/medication-induced obsessi ve-compulsive and re-
lated disorder) and repetitive choreoathetoid  movements associated with other neurolog-
ical disorders.
Comorbidity
Stereotypic movement d isorder may occur as a primary diagnosis or secondary to another
disorder. For example, stereotypies are a common manifestation of a variety of neuro-
genetic disorders, such as Lesch-Nyhan syndrome, Rett syndrome, fragile X syndrome,
Cornelia de Lange syndrome, and Smith-Magenis syndrome. When stereotypic move-