Overview
X chromosome anomaly is a broad term that was previously used to describe a range of conditions caused by changes in the number or structure of the X chromosome. This term is now considered obsolete in medical classification systems, meaning it has been replaced by more specific diagnoses. The X chromosome is one of the two sex chromosomes (X and Y) that help determine biological sex. Females typically have two X chromosomes (XX), and males typically have one X and one Y chromosome (XY). When there are extra, missing, or structurally altered X chromosomes, it can lead to a variety of health issues depending on the exact type of change. Conditions that were once grouped under this umbrella term include Turner syndrome (where a female has only one complete X chromosome), Klinefelter syndrome (where a male has an extra X chromosome), Triple X syndrome, and various structural rearrangements of the X chromosome such as deletions, duplications, or translocations. Symptoms vary widely depending on the specific anomaly and can range from mild to significant. They may include differences in growth and development, fertility problems, learning difficulties, and hormonal imbalances. Because this is an obsolete grouping term, patients who were previously given this diagnosis should work with a clinical geneticist to obtain a more precise and current diagnosis, which will guide appropriate management and treatment.
Key symptoms:
Short stature or unusually tall statureDelayed puberty or absent pubertyFertility problems or infertilityLearning difficultiesDevelopmental delaysHormonal imbalancesHeart defects (in some types)Differences in physical featuresMenstrual irregularitiesLow muscle toneBehavioral or emotional challengesSwelling of hands or feet in newborns (in some types)
Variable
Can be inherited in different ways depending on the underlying gene
Variable
Can begin at different ages, from infancy through adulthood
FDA & Trial Timeline
1 eventUniversity of Colorado, Denver
Data sourced from FDA regulatory filings and ClinicalTrials.gov. Updated periodically.
Treatments
No FDA-approved treatments are currently listed for OBSOLETE: X chromosome anomaly.
1 clinical trialare actively recruiting — trials can provide access to cutting-edge therapies.
View clinical trials →Specialists
View all specialists →No specialists are currently listed for OBSOLETE: X chromosome anomaly.
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 OBSOLETE: X chromosome anomaly.
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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 exact type of X chromosome change my child or I have, and what is the current medical name for this condition?,What specific health screenings and monitoring do I need on a regular basis?,Will hormone therapy be needed, and if so, when should it start?,What are the implications for fertility, and are there options available?,Are there any heart or other organ problems that need to be checked?,What educational or developmental support services should we look into?,Are there any clinical trials or new treatments being studied for this specific condition?
Common questions about OBSOLETE: X chromosome anomaly
What is OBSOLETE: X chromosome anomaly?
X chromosome anomaly is a broad term that was previously used to describe a range of conditions caused by changes in the number or structure of the X chromosome. This term is now considered obsolete in medical classification systems, meaning it has been replaced by more specific diagnoses. The X chromosome is one of the two sex chromosomes (X and Y) that help determine biological sex. Females typically have two X chromosomes (XX), and males typically have one X and one Y chromosome (XY). When there are extra, missing, or structurally altered X chromosomes, it can lead to a variety of health is
Are there clinical trials for OBSOLETE: X chromosome anomaly?
Yes — 1 recruiting clinical trial is currently listed for OBSOLETE: X chromosome anomaly on UniteRare. See the clinical trials section on this page for phase, sponsor, and site details sourced from ClinicalTrials.gov.