[Functional psychosis in childhood and adolescence].
OBJECTIVE
To review the literature about functional psychosis in children and adolescents, allowing pediatricians to recognize the pathology in their daily work routine.


METHODS
Classical textbooks of child and adolescent psychiatry; search of MEDLINE and Lilacs databases (1993 to 2003). Computerized search methods were combined with manual search of the literature.


RESULTS
This article is structured in topics, trying to define and classify psychosis in childhood and adolescence, with schizophrenia being the main disorder. The article stresses the difficulties for the diagnosis in children, and addresses the main treatment guidelines.


CONCLUSIONS
Schizophrenia beginning in childhood, or very-early-onset schizophrenia, is a very rare pathology, almost 50-fold less frequent than early-onset schizophrenia (appearing at age 15 or later). Childhood-onset schizophrenia is a separate disorder, different from infantile autism, not only in terms of conceptual issues, but also in terms of phenomenology, genetics and associated clinical and neurological issues.
Tengan
Sérgio K
SK
Faculdade de Ciências Médicas, Irmandade da Santa Casa de Misericórdia de São Paulo. infancia.caism@ig.com.br
Maia
Anne K
AK
D000293:Adolescent; D017668:Age of Onset; D002648:Child; D006801:Humans; D011379:Prognosis; D011618:Psychotic Disorders / Q000175:diagnosis* / Q000209:etiology / Q000628:therapy; D012559:Schizophrenia / Q000175:diagnosis* / Q000209:etiology / Q000628:therapy