Congenital testicular dysgenesis in children
Congenital testicular dysgenesis, also known as Klinefetter syndrome, is a sex chromosome disease with a high incidence. Before chromosome identification, Klinefelter first reported this disease in 1942. Bradbury et al. showed that the patient's somatic cells showed female X chromatin in 1956. Jacobs and Strong first found that the chromosome karyotype of the patient was 47, XXY in 1959. It is more likely to occur in older women during pregnancy. Abnormal sex chromosomes lead to testicular dysgenesis, infertility, mental retardation, etc. The symptoms of this disease are not obvious before puberty, so it is not easy to detect early.