[Sexually aggressive acts of an adolescent with Klinefelter syndrome].

Using the case of an average gifted 15 years old youth with Klinefelter-syndrome (ks), who acted in a sexually aggressive manner, first the characteristics of this syndrome are described. In the following personality development and family background are compared to three hitherto published case examples of youths with ks or similar symptomatics on the one hand, and forty other sexually aggressive acting youths without ks on the other hand. In closing the possible significance of a treatment with a testosterone substitute is discussed.