In fact, ASD encompasses a number of syndromes that were individually classified in DSM-IV Asperger's disorder and pervasive developmental disorder not otherwise specified are gone. The name of the broader category in which autism is situated is no longer pervasive developmental disorder it is autism spectrum disorder (ASD). While many things about autism, such as key diagnostic features, remain similar in DSM-5, other aspects of the diagnosis involve major changes in DSM-5. It is good that DSM-5 allows for this, but the popularity of this practice reflects the still limited understanding we have of pathophysiology in autism and other syndromes defined on purely behavioral grounds. If, however, the symptoms are sufficient to meet criteria for other disorders, then the patient should be diagnosed as having two or more disorders. The presence of these other symptoms should be noted, and, if necessary, the patient should be treated. It is understood in both DSM-IV and DSM-5 that children who meet the criteria for autism often have symptoms of other disorders (anxiety disorders, affective disorders, attention deficit hyperactivity disorder, specific language disorders, and intellectual disability in particular). Rejecting a categorical understanding of autism (with its all-or-nothing approach to diagnosis) and replacing it with a dimensional model is a considerable improvement over DSM-IV. DSM-5 has been conceived as both conservative and progressive it attempts to keep important diagnostic traditions intact while it introduces clinically important paradigmatic shifts.
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