Rett Syndrome
Rett syndrome is a rare, but severe brain disorder that affects girls. It's usually discovered in the first two years of life, and a child's diagnosis with Rett syndrome can feel overwhelming. Although there's no cure, early identification and treatment may help girls and families who are affected by Rett syndrome.
Rett syndrome was at one time included under the Autism umbrella. Once a genetic cause for Rett (a mutation) was discovered, it was reclassified it as a neurologic disorder with a known genetic cause. That said, if someone has Rett syndrome as well as autistic symptoms, they are diagnosed with Autism Spectrum Disorder.