Could you name me, please, all the former diagnostic names with which, prior to 2013, in the USA, were indicated all the types of "regressive autism"?

CDD is a subset of PDD. Used to be separate, but after DSM-IV, got absorbed under ASD.

Rett Sydrome usually have signs of regression. But after DSM-IV is considered separate from ASD.

Super confusing.

I don’t know where you live but if you go to a large research library, you can look in the older editions of the DSM – the diagnostic manual of the APA – and search for the different diagnoses for autism and the autism spectrum.

Also, @raum ‘s answer was very good.

It might help if we understood why you need to know. Are you doing some sort of public presentation, or are you just curious?

@Patty_Melt: Just a curiosity of mine, silly me.

Get a copy of NeuroTribes. It’s a whopping big book on the history of autism. It should give you most of your answers. https://tvtropes.org/pmwiki/pmwiki.php/Literature/NeuroTribes

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