Are there any diseases/disorders where ASD is co-morbid?

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It's known that ASD has a lot of co-morbid conditions. But I wanna look at it the other way. Are there any diseases or disorders of the body that can cause ASD like symptoms?

In other words, are there diseases/disorders where ASD is a secondary condition?

Fragile X can be co-morbid with Autism.

~20% of autism spectrum is "complex autism", where the autistic traits are secondary to the main disorder, usually a genetic disorder, that has its own specific set of traits, and some of the traits resemble autsitc traits, and there are enough for autism diagnosis in some but not all cases.

e.g. Fragile X, Rett Syndrome, Timothy Syndrome, Prader-Willi Syndrome, etc etc etc.

Studies have shown that in Fragile X, the autistic traits are different from autistic traits in idiopathic autism (likely caused by many common genetic variants coming together in an individual).

Gender Dysphoria (Gender Identity Disorder) - ASD link is suspected.

http://www.huffingtonpost.com/kyle-simo ... 96317.html