Overview
Microcephalic primordial dwarfism (MPD) is a group of rare genetic conditions where a person is extremely small from very early in development — even before birth. The word 'primordial' means the growth restriction starts at the very beginning of life, and 'microcephalic' means the head is significantly smaller than average. Children with MPD are born very small and continue to grow much more slowly than their peers throughout life. Adult height is often well under four feet. There are several subtypes of microcephalic primordial dwarfism, including Seckel syndrome, Meier-Gorlin syndrome, microcephalic osteodysplastic primordial dwarfism types I and II (MOPD I and MOPD II), and others. Each subtype has its own specific features, but they share the hallmarks of very small body size and a small head. Some subtypes may also involve intellectual disability, skeletal abnormalities, distinctive facial features, and problems with blood vessels in the brain. There is currently no cure for MPD. Treatment focuses on managing symptoms and complications. This may include monitoring for brain blood vessel abnormalities (especially in MOPD II), supporting nutrition and growth, addressing skeletal problems, and providing developmental support. A team of specialists is usually needed to provide the best care. Early diagnosis through genetic testing can help families plan appropriate medical follow-up and connect with support resources.
Key symptoms:
Extremely small body size present from before birthVery small head (microcephaly)Short stature that remains well below average throughout lifeLow birth weightDistinctive facial features such as a sloping forehead or prominent noseSkeletal abnormalities including thin bones or joint problemsIntellectual disability (varies by subtype — some have normal intelligence)Feeding difficulties in infancyDental problems or missing teethSmall or absent kneecaps (in Meier-Gorlin syndrome)Small earsHigh-pitched voiceBlood vessel abnormalities in the brain (especially in MOPD II)Vision problemsInsulin resistance or blood sugar issues in some cases
Autosomal recessive
Passed on when both parents carry the same gene change; often skips generations
Neonatal
Begins at or shortly after birth (first 4 weeks)
Treatments
No FDA-approved treatments are currently listed for Microcephalic primordial dwarfism.
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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 Microcephalic primordial dwarfism.
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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.Which specific subtype of microcephalic primordial dwarfism does my child have, and what gene is involved?,How often should brain imaging (MRI/MRA) be done to check for blood vessel problems?,What developmental milestones should we watch for, and when should we be concerned?,Are there any clinical trials or research studies we could participate in?,What specialists should be part of our care team, and how often should we see them?,What emergency signs should we watch for at home?,What school accommodations or early intervention services should we request?
Common questions about Microcephalic primordial dwarfism
What is Microcephalic primordial dwarfism?
Microcephalic primordial dwarfism (MPD) is a group of rare genetic conditions where a person is extremely small from very early in development — even before birth. The word 'primordial' means the growth restriction starts at the very beginning of life, and 'microcephalic' means the head is significantly smaller than average. Children with MPD are born very small and continue to grow much more slowly than their peers throughout life. Adult height is often well under four feet. There are several subtypes of microcephalic primordial dwarfism, including Seckel syndrome, Meier-Gorlin syndrome, mic
How is Microcephalic primordial dwarfism inherited?
Microcephalic primordial dwarfism follows a autosomal recessive inheritance pattern. Genetic counseling can help families understand recurrence risk and testing options.
At what age does Microcephalic primordial dwarfism typically begin?
Typical onset of Microcephalic primordial dwarfism is neonatal. Age of onset can vary across affected individuals.
Which specialists treat Microcephalic primordial dwarfism?
2 specialists and care centers treating Microcephalic primordial dwarfism are listed on UniteRare, sourced from ClinicalTrials.gov principal investigators, published research, and the NPPES NPI registry.