Rett syndrome: a case report.

Rett syndrome (RS) is a progressive neurodegenerative disorder characterized by almost exclusive occurrence in females, autistic behavior, dementia, gait ataxia, loss of purposeful use of the hands with stereotypic hand movement. Initially RS was considered to be very rare; however, recent reports suggest that the prevalence is considerably higher and occurrence is world-wide. There are as yet no pathognomonic laboratory markers and its pathogenesis and etiology are unknown. We report a 4-year-old girl who fulfilled the clinical criteria of classic Rett syndrome.