Overview
Thrombocythemia with distal limb defects is an extremely rare genetic condition that combines two main problems: a blood disorder and abnormalities in the hands and feet. The blood disorder involves thrombocythemia, which means the body makes too many platelets. Platelets are small blood cells that help with clotting, but when there are too many, they can cause abnormal blood clots or, paradoxically, bleeding problems. The limb defects typically affect the ends of the arms and legs (called distal limb defects), which may include absent or underdeveloped fingers or toes, shortened bones in the hands or feet, or other structural differences in the extremities. These limb differences are usually present at birth. Because this condition is so rare, the medical understanding of it is limited. The combination of a blood platelet disorder with skeletal abnormalities of the limbs suggests a shared genetic pathway that affects both blood cell production and limb development during fetal growth. Treatment is generally focused on managing symptoms. The high platelet count may need monitoring and sometimes medication to reduce the risk of clotting or bleeding complications. The limb differences may require orthopedic evaluation and, in some cases, surgical intervention or adaptive devices to improve function. Patients benefit from a coordinated team of specialists who can address both the blood and skeletal aspects of the condition.
Also known as:
Key symptoms:
High platelet count in the bloodMissing or underdeveloped fingers or toesShortened bones in the hands or feetAbnormal blood clottingUnusual bleeding or bruisingStructural differences in the handsStructural differences in the feetAbsent or small nails on fingers or toesPossible bone marrow abnormalities
Autosomal dominant
Passed on from just one parent; each child has about a 50% chance of inheriting it
Neonatal
Begins at or shortly after birth (first 4 weeks)
Treatments
No FDA-approved treatments are currently listed for Thrombocythemia with distal limb defects.
View clinical trials →Clinical Trials
View all trials with filters →No actively recruiting trials found for Thrombocythemia with distal limb defects at this time.
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Specialists
View all specialists →No specialists are currently listed for Thrombocythemia with distal limb defects.
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 Thrombocythemia with distal limb defects.
Community
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Caregiver Resources
NORD Caregiver Resources
Support, advocacy, and financial assistance for caregivers of rare disease patients.
Mental Health Support
Rare disease caregiving can be isolating. Connect with counseling and peer support.
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.How high is my (or my child's) platelet count, and how often should it be checked?,What medications are recommended to manage the high platelet count, and what are their side effects?,What are the warning signs of a dangerous blood clot or bleeding episode?,Would genetic testing help us understand the cause and guide family planning?,What surgeries or therapies are available to improve hand or foot function?,Are there any activities or medications we should avoid because of the high platelet count?,Is there a specialist center or research program focused on this condition?
Common questions about Thrombocythemia with distal limb defects
What is Thrombocythemia with distal limb defects?
Thrombocythemia with distal limb defects is an extremely rare genetic condition that combines two main problems: a blood disorder and abnormalities in the hands and feet. The blood disorder involves thrombocythemia, which means the body makes too many platelets. Platelets are small blood cells that help with clotting, but when there are too many, they can cause abnormal blood clots or, paradoxically, bleeding problems. The limb defects typically affect the ends of the arms and legs (called distal limb defects), which may include absent or underdeveloped fingers or toes, shortened bones in the
How is Thrombocythemia with distal limb defects inherited?
Thrombocythemia with distal limb defects follows a autosomal dominant inheritance pattern. Genetic counseling can help families understand recurrence risk and testing options.
At what age does Thrombocythemia with distal limb defects typically begin?
Typical onset of Thrombocythemia with distal limb defects is neonatal. Age of onset can vary across affected individuals.