Overview
Cranio-osteoarthropathy, also known as pachydermoperiostosis or primary hypertrophic osteoarthropathy, is a rare genetic condition that affects the bones, joints, and skin. The disease causes abnormal thickening of the skin (especially on the face, scalp, hands, and feet), excessive sweating, and new bone growth along the surfaces of long bones (called periostosis). People with this condition often develop clubbing of the fingers and toes, where the fingertips become enlarged and rounded. The facial skin may become thickened and furrowed, giving a coarsened appearance sometimes described as "lion-like facies." Joint pain and swelling, particularly in the knees, ankles, and wrists, are common and can significantly limit movement. The condition typically begins during adolescence or early adulthood and progresses over several years before stabilizing. The severity varies widely — some people have mild symptoms while others experience significant disability from joint problems and cosmetic concerns. There is currently no cure for cranio-osteoarthropathy. Treatment focuses on managing symptoms, including pain relief with anti-inflammatory medications (such as NSAIDs), and in some cases surgical procedures to address cosmetic concerns or joint complications. Some patients benefit from medications that target prostaglandin pathways, as excess prostaglandin E2 production plays a key role in the disease process.
Key symptoms:
Thickening and furrowing of facial skinClubbing of fingers and toesExcessive sweating, especially on hands and feetJoint pain and swellingNew bone growth along the long bonesEnlarged and coarsened facial featuresThickening of the scalp with deep foldsOily skin and acneSwollen and painful knees, ankles, or wristsEnlarged hands and feetFatigueLimited joint movementDrooping eyelids (ptosis)
Clinical phenotype terms (14)— hover any for plain English
Variable
Can be inherited in different ways depending on the underlying gene
Juvenile
Begins in the teen years
Treatments
No FDA-approved treatments are currently listed for Cranio-osteoarthropathy.
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Specialists
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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 Cranio-osteoarthropathy.
Community
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Caregiver Resources
NORD Caregiver Resources
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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.Which gene mutation is causing my condition, and what does that mean for my family members?,What treatments are available to manage my joint pain and skin changes?,Are there any clinical trials or new therapies being studied for this condition?,How often should I have follow-up appointments and imaging studies?,Should my siblings or children be tested for this condition?,What can be done about the excessive sweating?,Are there surgical options to address the changes in my facial appearance?
Common questions about Cranio-osteoarthropathy
What is Cranio-osteoarthropathy?
Cranio-osteoarthropathy, also known as pachydermoperiostosis or primary hypertrophic osteoarthropathy, is a rare genetic condition that affects the bones, joints, and skin. The disease causes abnormal thickening of the skin (especially on the face, scalp, hands, and feet), excessive sweating, and new bone growth along the surfaces of long bones (called periostosis). People with this condition often develop clubbing of the fingers and toes, where the fingertips become enlarged and rounded. The facial skin may become thickened and furrowed, giving a coarsened appearance sometimes described as "l
At what age does Cranio-osteoarthropathy typically begin?
Typical onset of Cranio-osteoarthropathy is juvenile. Age of onset can vary across affected individuals.