Treatment and Managing Your Care

Treatment for aromatase deficiency is not a “one size fits all” approach. Because the condition is so rare, there are no universal clinical guidelines; instead, care is highly individualized and guided by experienced pediatric or adult endocrinologists ^[1][2]. The primary goal of treatment is estrogen replacement therapy, which aims to mimic the body’s natural hormone levels to support bone health, growth, and development.

The Approach: 17β-Estradiol

The foundation for treatment is replacing the missing estrogen, typically using 17β-estradiol ^[3][4]. This is the same form of estrogen the body would naturally produce if the aromatase enzyme were working correctly.

Treatment for 46,XX Individuals

For 46,XX individuals, the strategy is often to mirror the gradual hormone rise seen in typical female development.

• Early Childhood: In some cases, very low doses of oral estradiol may be started early to support bone health and internal organ development ^[3].
• Puberty: As an individual reaches pubertal age, the dose is gradually increased. The goal is to induce secondary sex characteristics (like breast development) and support the growth of the uterus and ovaries ^[3][5].
• Biochemical Targets: Doctors monitor estradiol levels, bone age, and gonadotropins (FSH and LH). Dosing is highly individualized and guided by clinical development and your specific goals, rather than treating gonadotropins (FSH/LH) to a fixed target. Escalating estrogen solely to normalize FSH and LH is not recommended and should never be done without the prescribing team ^[3].
• Long-term Cycles: Once the uterine lining has developed, doctors typically introduce a second hormone (progestogen) in a cyclic pattern to allow for regular withdrawal bleeding and protect the health of the uterus ^[5].

Treatment for 46,XY Individuals

In 46,XY individuals, the goals are often focused on the skeleton and metabolic health.

• Bone Health and Height: A key goal for some is to “fuse” the epiphyses (growth plates). Without estrogen, these plates stay open, leading to continuous growth and weak bones ^[4][6]. Estrogen treatment can help stop further height gain and increase bone density, reducing the risk of fractures ^[7].
• Delivery Methods: Many specialists use transdermal estradiol (patches or gels applied to the skin). Small case reports have shown that transdermal doses can help fuse growth plates, improve energy and libido, and normalize hormone levels within months, though this timeline and route are highly individualized ^[4][8].
• Fertility Preservation: Fertility outcomes are uncertain. While some case reports suggest careful estrogen replacement can support bone health while preserving spermatogenesis (sperm production), exogenous estrogen can suppress sperm production ^[8]. It is strongly recommended to discuss fertility preservation, such as semen cryopreservation, with a reproductive specialist before starting treatment when developmentally appropriate.

Medication Safety

Like all medications, estrogen therapy has expected effects and potential risks that depend on the route, dose, and personal history (such as clotting problems, smoking, or migraines with aura).

• Expected Effects: You may experience breast tenderness, nausea, headache, mood changes, or expected withdrawal bleeding. Discuss how to manage these with your care team. Never adjust your prescribed dose without consulting your endocrinology team, and follow instructions regarding missed doses.
• Urgent Symptoms: Seek immediate emergency help if you develop sudden chest pain, shortness of breath, severe headache or vision changes, unilateral (one-sided) leg swelling, or jaundice.

Monitoring Success

Success isn’t measured by a single number, but by a combination of factors based on shared decisions about skeletal benefit and reproductive priorities:

1. Skeletal Maturity: Regular X-rays to check “bone age” and ensure growth plates are responding to treatment ^[4][9].
2. Bone Density: Using DXA scans to track improvements in bone strength ^[7].
3. Hormone Balance: Blood tests to ensure estradiol is in a healthy range and that androgens (like testosterone) and gonadotropins (FSH/LH) are interpreted in context ^[3][8].
4. Physical Well-being: Improvements in symptoms like bone pain, energy levels, and appropriate physical development.

The Importance of Specialized Care

Because aromatase deficiency is a lifelong condition, care must eventually transition from a pediatric endocrinologist to an adult specialist. This ensures that bone health and metabolic factors (like cholesterol and blood sugar) continue to be monitored throughout adulthood ^[2][10]. Your care team should ideally include experts in rare steroid disorders who understand the nuances of these hormone interactions.