Overview
Calf-predominant weakness-gastrocnemius medialis atrophy-distal myopathy is a very rare inherited muscle disease that primarily affects the lower legs, especially the calf muscles. The condition is characterized by progressive weakness and wasting (atrophy) of the gastrocnemius medialis muscle, which is the inner part of the main calf muscle. Over time, patients notice difficulty with activities that rely on calf strength, such as walking on tiptoes, climbing stairs, or walking long distances. The weakness typically starts in the distal muscles (those farthest from the center of the body, like the calves and feet) and may gradually progress. This condition falls under the broader category of distal myopathies, which are a group of muscle disorders that preferentially affect the hands, forearms, lower legs, or feet. Because it is so rare and was only recently characterized, knowledge about the full range of symptoms and long-term outcomes is still evolving. Diagnosis usually involves a combination of clinical examination, muscle imaging (such as MRI showing selective atrophy of the gastrocnemius medialis), and genetic testing. There is currently no cure for this condition, and treatment focuses on managing symptoms, maintaining mobility, and preventing complications such as falls or joint contractures. Physical therapy and assistive devices may be helpful in preserving function and quality of life.
Also known as:
Key symptoms:
Weakness in the calf musclesWasting or thinning of the inner calf muscle (gastrocnemius medialis)Difficulty walking on tiptoesTrouble climbing stairsFoot drop or difficulty lifting the front of the footUnsteady walking or frequent trippingMuscle fatigue in the lower legsAsymmetric calf muscle sizeDifficulty with prolonged walking or standingPossible mild weakness in other leg muscles over time
Autosomal dominant
Passed on from just one parent; each child has about a 50% chance of inheriting it
Adult
Begins in adulthood (age 18 or older)
Treatments
No FDA-approved treatments are currently listed for Calf-predominant weakness-gastrocnemius medialis atrophy-distal myopathy.
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Specialists
View all specialists →No specialists are currently listed for Calf-predominant weakness-gastrocnemius medialis atrophy-distal myopathy.
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 Calf-predominant weakness-gastrocnemius medialis atrophy-distal myopathy.
Community
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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 expected rate of progression for my specific case?,Are there any genetic tests that can confirm my diagnosis or identify the specific gene involved?,What physical therapy exercises are most beneficial for maintaining my calf and leg strength?,Should I use ankle-foot orthoses or other assistive devices, and when should I start?,Are there any clinical trials or research studies I could participate in?,Is there a risk that my children could inherit this condition?,How often should I have follow-up appointments and muscle imaging?
Common questions about Calf-predominant weakness-gastrocnemius medialis atrophy-distal myopathy
What is Calf-predominant weakness-gastrocnemius medialis atrophy-distal myopathy?
Calf-predominant weakness-gastrocnemius medialis atrophy-distal myopathy is a very rare inherited muscle disease that primarily affects the lower legs, especially the calf muscles. The condition is characterized by progressive weakness and wasting (atrophy) of the gastrocnemius medialis muscle, which is the inner part of the main calf muscle. Over time, patients notice difficulty with activities that rely on calf strength, such as walking on tiptoes, climbing stairs, or walking long distances. The weakness typically starts in the distal muscles (those farthest from the center of the body, like
How is Calf-predominant weakness-gastrocnemius medialis atrophy-distal myopathy inherited?
Calf-predominant weakness-gastrocnemius medialis atrophy-distal myopathy follows a autosomal dominant inheritance pattern. Genetic counseling can help families understand recurrence risk and testing options.
At what age does Calf-predominant weakness-gastrocnemius medialis atrophy-distal myopathy typically begin?
Typical onset of Calf-predominant weakness-gastrocnemius medialis atrophy-distal myopathy is adult. Age of onset can vary across affected individuals.