This is a description of one of Leo Kanner's autistic "patients", from a follow-up study Kanner published in 1956 with his colleague Leon Eisenberg. This paper is reprinted in Kanner's 1973 book.
Jay S., now almost 15 years old, presented in the lower grades considerable difficulties to his teachers, who were exceptionally understanding and accepting. He wandered about the classroom, masturbated openly, and staged temper tantrums. He learned to conform, did phenomenally well in mathematics, was sent to an accelerated school, and is now finishing the eleventh grade with top marks. He is a peculiar child, rather obese, who spends his spare time collecting maps and postage stamps and has little more to do with people than is absolutely necessary for the maintenance of a superficial relationship. He achieved a Binet IQ of not less than 150.
Kanner, L. & Eisenberg, L. (1956/1973). Notes on the follow-up studies. In Kanner, L., Childhood Psychosis: Initial Studies and New Insights. Washington D.C.: Winston, pp 77-90.