Impairs male sexual development.Encyclopedia Entry for Androgen Insensitivity Syndrome :Androgen insensitivity syndrome. AIS is caused by genetic defects on the X chromosome. These defects make the body unable to respond to the hormones that produce a male appearance. The syndrome is divided into two main categories: Complete AIS Incomplete AIS Complete androgen insensitivity prevents the penis and other male body parts from developing. At birth, the child looks like a girl. The complete form of the syndrome occurs in as many as 1 in 20,000 live births. In incomplete AIS, people have different numbers of male traits. Incomplete AIS can include other disorders, such as: Failure of one or both testes to descend into the scrotum after birth Hypospadias , a condition in which the opening of the urethra is on the underside of the penis, instead of at the tip Reifenstein syndrome (also known as Gilbert-Dreyfus syndrome or Lubs syndrome) Infertile male syndrome is also considered to be part of incomplete AIS.A person with complete AIS appears to be female but has no uterus, and has very little armpit and pubic hair. At puberty, female sex characteristics (such as breasts) develop. However, the person does not menstruate and become fertile. People with incomplete AIS may have both male and female physical characteristics. Many have partial closing of the outer vagina, an enlarged clitoris, and a short vagina. There may be: A vagina but no cervix or uterus Inguinal hernia with testes that can be felt during a physical exam Normal female breasts Testes in the abdomen or other atypical places in the body.Complete AIS is rarely discovered during childhood. Sometimes, a growth is felt in the abdomen or groin that turns out to be a testicle when it is explored with surgery. Most people with this condition are not diagnosed until they DO NOT get a menstrual period or they have trouble getting pregnant. Incomplete AIS is often discovered during childhood because the person may have both male and female physical traits. Tests used to diagnose this condition may include: Blood work to check levels of testosterone, luteinizing hormone (LH), and follicle-stimulating hormone (FSH) Genetic testing (karyotype) to determine the person's genetic makeup Pelvic ultrasound Other blood tests may be done to help tell the difference between AIS and androgen deficiency.Testicles that are in the wrong place may not be removed until a child finishes growing and goes through puberty. At this time, the testes may be removed because they can develop cancer, just like any undescended testicle. Estrogen replacement is prescribed after puberty. Treatment and gender assignment can be a very complex issue, and must be targeted to each individual person.The outlook for complete AIS is good if the testicle tissue is removed at the right time. The outlook for incomplete AIS depends on the appearance of the genitals.Complications include: Infertility Psychological and social issues Testicular cancer.Call your health care provider if you or your child has signs or symptoms of the syndrome.Testicular feminization.Male reproductive anatomy Male reproductive anatomy Female reproductive anatomy Female reproductive anatomy Female reproductive anatomy Female reproductive anatomy Karyotyping Karyotyping.Achermann JC, Hughes IA. Pediatric disorders of sex development.