This Syndrome does not occur for genetic inheritance, however it is fruit of an internal mutation of chromosome X, justifying the biggest incidence in the women. The girls if become anxious irritadias and start to make movements estereotipados with the hands. When bigger they can recoup part of the capacity to interact socially, however the psicomotor damage does not present regressions. (VARELLA, 2010) 3) Another illness that presents similar symptoms to the one of the Autismo is the Desintegrativa Disturbance of Infncia (PDI), that it is characterized for loss of the language, of the necessity and pleasure to establish visual contact loss of the not verbal communication, as to point objects. It occurs in the five first years of life, obligatorily. According to Schwartzman (2006), the children who present this upheaval execute normal and appropriate activities to the age, however from the 2 years of life and, before the 10, the child she suffers alterations that take the significant losses of the communicative processes, mannering and social.

It is also known as syndrome of Heller, infantile dementia or desintegrativa psychosis e, can present alterations the neurological level, generating even though, mental retardation, with presence of abnormalitys in EEG (Eletroencefalograma). According to DSM-IV-TR (2003), the criteria for disgnostic evaluation of the PDI are: pparently normal Development, at least during the 2 first years after the birth, revealed for the presence of verbal and not-verbal communication, social relationships, appropriate games and adaptativo behavior to the age. clinically significant Loss of acquired abilities already (before the 10 years) in at least two of the following areas: (1) expressive or receptive language (2) social abilities or adaptativo behavior (3) intestinal or vesical control (4) games (5) motor abilities Abnormalitys of the functioning in at least two of the following areas: (1) qualitative damage in the social interaction.