Overview
46,XY disorder of gonadal development (also called 46,XY gonadal dysgenesis or 46,XY DSD — disorder of sex development) is a rare condition in which a person has male chromosomes (46,XY) but their gonads (the organs that normally become testes or ovaries) do not develop as expected. This means the body may not produce enough male hormones during development in the womb, leading to differences in how the reproductive organs and genitalia form. The external appearance can range widely — from typically female, to ambiguous, to mostly male — depending on how much the gonads are affected. There are two main forms: complete gonadal dysgenesis (sometimes called Swyer syndrome when fully female in appearance) and partial gonadal dysgenesis, where the gonads develop partially. In complete forms, individuals often appear female at birth and may not be diagnosed until puberty fails to occur. In partial forms, the genitalia may appear ambiguous at birth, prompting earlier evaluation. Treatment depends on the specific situation and may include hormone replacement therapy to support puberty and bone health, surgical management of the gonads (especially because underdeveloped gonads carry a risk of tumor formation), and reconstructive surgery if desired. Psychological support and ongoing endocrine care are important parts of management. Many people with this condition live full, healthy lives with appropriate medical care, though fertility is often affected.
Key symptoms:
Genitalia that appear different from what is expected for a boy or girlAmbiguous genitalia at birthFailure to go through puberty naturallyAbsence of menstrual periods in individuals raised as femaleUndescended testes or absent testesStreak gonads (thin, non-functional gonadal tissue)Infertility or reduced fertilityBreast development may not occur without hormone therapyShort stature or tall stature depending on the specific causePossible development of gonadal tumors if gonads are not removedLack of body hair development during teen yearsDifferences in internal reproductive structures
Variable
Can be inherited in different ways depending on the underlying gene
Variable
Can begin at different ages, from infancy through adulthood
Treatments
No FDA-approved treatments are currently listed for 46,XY disorder of gonadal development.
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Treatment Centers
8 centersBaylor College of Medicine Rare Disease Center ↗
Baylor College of Medicine
📍 Houston, TX
🏥 NORDStanford Medicine Rare Disease Center ↗
Stanford Medicine
📍 Stanford, CA
🔬 UDNNIH Clinical Center Undiagnosed Diseases Program ↗
National Institutes of Health
📍 Bethesda, MD
🔬 UDNUCLA UDN Clinical Site ↗
UCLA Health
📍 Los Angeles, CA
🔬 UDNBaylor College of Medicine UDN Clinical Site ↗
Baylor College of Medicine
📍 Houston, TX
🔬 UDNHarvard/MGH UDN Clinical Site ↗
Massachusetts General Hospital
📍 Boston, MA
🏥 NORDMayo Clinic Center for Individualized Medicine ↗
Mayo Clinic
📍 Rochester, MN
👤 Mayo Clinic Center for Individualized Medicine
🏥 NORDUCLA Rare Disease Day Program ↗
UCLA Health
📍 Los Angeles, CA
Travel Grants
No travel grants are currently matched to 46,XY disorder of gonadal development.
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Caregiver Resources
NORD Caregiver Resources
Support, advocacy, and financial assistance for caregivers of rare disease patients.
Mental Health Support
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Family & Caregiver Grants
Financial assistance programs specifically for caregivers of rare disease patients.
Social Security Disability
Learn how rare disease patients may qualify for SSDI/SSI benefits.
Questions for your doctor
Bring these to your next appointment
- Q1.What is the specific genetic cause of my child's condition, and should we pursue further genetic testing?,What is the risk of gonadal tumors, and when should gonadectomy be considered?,What hormone replacement therapy options are available, and when should they start?,How will this condition affect puberty, fertility, and long-term health?,Should we see a psychologist or counselor who specializes in differences of sex development?,Are there any clinical trials or new treatments we should know about?,What does long-term follow-up look like, and how often should we have check-ups?
Common questions about 46,XY disorder of gonadal development
What is 46,XY disorder of gonadal development?
46,XY disorder of gonadal development (also called 46,XY gonadal dysgenesis or 46,XY DSD — disorder of sex development) is a rare condition in which a person has male chromosomes (46,XY) but their gonads (the organs that normally become testes or ovaries) do not develop as expected. This means the body may not produce enough male hormones during development in the womb, leading to differences in how the reproductive organs and genitalia form. The external appearance can range widely — from typically female, to ambiguous, to mostly male — depending on how much the gonads are affected. There ar
Which specialists treat 46,XY disorder of gonadal development?
18 specialists and care centers treating 46,XY disorder of gonadal development are listed on UniteRare, sourced from ClinicalTrials.gov principal investigators, published research, and the NPPES NPI registry.