Androgen Insensitivity Syndrome: Diagnosis & Treatment

Written by Medicover Team and Medically Reviewed by Dr Girija Kalyani Pappala , Endocrinologists

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1. Causes 2. Find a Doctor 3. Diagnosis 4. Treatment 5. FAQs

Androgen Insensitivity Syndrome (AIS) is a condition that affects sexual development before birth and during puberty. People with AIS are genetically male, with one X and one Y chromosome, but their bodies are unable to respond to male sex hormones called androgens. This can result in a range of physical traits, from a typical female appearance to mixed characteristics of both sexes.

What Are The Different Types Of Androgen Insensitivity Syndrome?

AIS can be classified into three main types based on how much the body can respond to androgens:

Complete Androgen Insensitivity Syndrome (CAIS)

People with CAIS have a typical female external appearance despite having XY chromosomes. They are usually raised as girls and often do not realize they have CAIS until they fail to menstruate during puberty. Internally, they lack a uterus and ovaries but have undescended testes.

Partial Androgen Insensitivity Syndrome (PAIS)

In PAIS, individuals have a mix of male and female physical characteristics. The degree of insensitivity to androgens can vary, leading to diverse traits such as ambiguous genitalia. They might have hypospadias (where the opening of the penis is on the underside) or a small penis. Puberty can bring about partial breast development and some male secondary sexual characteristics.

Mild Androgen Insensitivity Syndrome (MAIS)

People with MAIS have a male appearance, but they may have issues like reduced body hair, infertility, or gynecomastia (enlarged breast tissue in males). MAIS is often diagnosed when individuals seek help for these specific issues.

What Are the Symptoms of Androgen Insensitivity Syndrome?

Androgen Insensitivity Syndrome (AIS) is a genetic condition in which the body's cells cannot respond properly to male sex hormones (androgens). Symptoms vary depending on whether the condition is complete, partial, or mild, and may become apparent at birth, during childhood, or at puberty.

Female external genitalia in individuals with XY chromosomes: Seen in complete androgen insensitivity syndrome (CAIS).
Ambiguous genitalia: Partial androgen insensitivity syndrome (PAIS) may cause genitalia that are not clearly male or female.
Undescended testes: Testes may remain in the abdomen or groin instead of descending into the scrotum.
Absent or sparse pubic and underarm hair: Particularly common in complete androgen insensitivity syndrome.
Primary amenorrhea: Absence of menstrual periods despite normal breast development.
Normal breast development: Breast development usually occurs during puberty in individuals with complete androgen insensitivity syndrome.
Infertility: Most individuals with complete androgen insensitivity syndrome are unable to have biological children.
Reduced male secondary sexual characteristics: Mild forms may present with reduced facial hair, gynecomastia, or infertility in individuals raised as males.
Inguinal or abdominal masses: Undescended testes may be discovered during evaluation for a groin hernia or abdominal swelling.

What Are The Common Causes Of Androgen Insensitivity Syndrome?

AIS is caused by mutations in the AR gene, which provides instructions for making androgen receptors. These receptors allow the body to respond to androgens. When mutations occur, they can lead to the receptor not functioning properly or not being made at all. This means that the body cannot respond to androgens, resulting in the physical traits seen in AIS.

Genetic Inheritance

AIS is an X-linked recessive condition, which means it is passed down through the X chromosome. Females have two X chromosomes, so if they inherit one defective AR gene, they are carriers but typically do not show symptoms. Males, having only one X chromosome, will exhibit symptoms if they inherit the defective gene.

When to See a Doctor for Androgen Insensitivity Syndrome?

An endocrinologist or gynecologist specializes in AIS. Early diagnosis and ongoing hormonal monitoring are essential, as untreated AIS can impact growth, bone health, and psychological well-being significantly.

You should see a doctor if you have:

Absence of menstruation (primary amenorrhea) by age 16 in individuals raised female
Inguinal hernia in infants or young children, especially if the gonads are palpable
Delayed or incomplete puberty with unusual hormone test results

Get medical help immediately if:

Sudden severe pelvic or abdominal pain, which may indicate gonadal torsion or rupture
Signs of acute hormonal crisis, such as extreme fatigue,vomiting, or loss of consciousness
Rapid psychological distress or crisis following a new AIS diagnosis requires immediate support

These could be signs of a serious complication like Androgen Insensitivity Syndrome, which needs urgent care.

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How Is Androgen Insensitivity Syndrome Diagnosed?

Diagnosing AIS often involves a combination of physical examinations, genetic testing, and hormone level assessments.

Physical Examination

A healthcare provider will conduct a thorough physical examination, looking for signs such as ambiguous genitalia, undescended testes, or lack of menstruation in adolescent girls.

Genetic Testing

Genetic testing can confirm a diagnosis of AIS by identifying mutations in the AR gene. This involves taking a blood sample and analyzing the DNA for specific changes.

Hormone Levels

Hormone tests measure the levels of androgens and other sex hormones in the blood. In AIS, androgen levels may be normal or even elevated, but the body does not respond to these hormones as it should.

What Are The Treatment Options For Androgen Insensitivity Syndrome?

Treatment for AIS depends on the type and the specific needs of the individual. Here are some common approaches:

Hormone Replacement Therapy (HRT)

For individuals with CAIS, hormone replacement therapy (HRT) may be necessary after puberty to provide estrogen, which helps maintain female secondary sexual characteristics and bone health.

Surgery

Surgical interventions may be considered for various reasons:

Undescended Testes: For individuals with CAIS, undescended testes are often removed to prevent the risk of cancer.
Genital Surgery: For those with PAIS, surgery may be performed to address ambiguous genitalia or to create a more typical female or male appearance.

Psychological Support

Living with AIS can be challenging, and psychological support is often an important part of treatment. Counseling can help individuals and their families understand the condition, cope with emotional challenges, and make informed decisions about medical care.

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How Can Androgen Insensitivity Syndrome Be Prevented?

Currently, there is no way to prevent AIS because it is a genetic condition. However, genetic counseling can be helpful for families with a history of AIS. Genetic counselors can provide information about the risks of passing the condition to offspring and discuss potential reproductive options.

Genetic Counseling

Genetic counseling is recommended for:

Families with a History of AIS: Genetic counselors can help families understand the inheritance pattern and the likelihood of recurrence in future pregnancies.
Carrier Testing: Carrier testing can identify women who carry the defective AR gene, which can inform family planning decisions.

Living with Androgen Insensitivity Syndrome

Living with AIS involves managing both physical and emotional aspects of the condition. Here are some tips for individuals and families:

Education and Awareness

Educating oneself about AIS and staying informed about new research and treatments is crucial. Understanding the condition helps individuals make informed decisions about their health and well-being.

Support Networks

Joining support groups or online communities can provide a sense of belonging and shared experience. Connecting with others who have AIS or similar conditions can offer emotional support and practical advice.

Regular Medical Check-Ups

Regular medical check-ups are important to monitor health and address any issues that may arise. This includes bone health monitoring for those on HRT and regular screenings for potential complications.