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Living with Kyphosis-lateral tongue atrophy-myofibrillar myopathy syndrome

A rare genetic muscle disease from birth or childhood with slowly worsening weakness mostly in the legs, a curved spine, and tongue changes.

Understanding Kyphosis-lateral tongue atrophy-myofibrillar myopathy syndrome

Kyphosis-lateral tongue atrophy-myofibrillar myopathy syndrome is a rare genetic muscle disease with slowly worsening weakness, mostly in the legs.

It starts from birth to childhood. People have muscle weakness and wasting mainly in the legs, joint contractures, a curved spine, shrinking at the sides of the tongue, and tight ankles. Some later have upper limb weakness, facial weakness, language problems, intellectual disability, or behavior changes.

Signs & symptoms

GARD doesn't list specific symptoms for this condition yet. Its summary describes these features:

  • Slowly worsening muscle weakness, mostly in the legs
  • Muscle wasting
  • Tight joints (contractures)
  • Curved spine (kyphosis or lordosis)
  • Shrinking at the sides of the tongue
  • Tight ankles

Not everyone has every symptom. GARD's list comes from the Human Phenotype Ontology.

Diagnosis

  1. Talk with your doctor

    Share the symptoms you've noticed, when they started and your family health history. Notes and photos can help.

  2. See a specialist

    Specialists who may be involved include brain and nervous system specialists and genetic specialists.

  3. Consider genetic testing

    Changes in KY are linked to this condition. Genetic testing and counseling can help confirm a diagnosis and explain what it means for your family.

Care & treatment

Care team
Brain and nervous system specialists (neurologists); Genetic specialists (geneticists)
Expert care
Ask about multidisciplinary care centers for rare conditions
Treatment
GARD doesn't list specific treatments for this condition. Your care team will tailor care to your symptoms.
Research
Clinical trials and observational studies may be options. See the research section below.

General information, not medical advice. Your care team makes the decisions.

Everyday life

Living with a rare condition is easier with support.

  • Connect with rare disease patient organizations for support
  • Keep notes on symptoms, changes and questions for appointments
  • Ask about patient registries that help research
  • Look into financial aid and travel resources for care visits
Bring these questions to your next doctor visit
Can genetic testing for the KY gene confirm the diagnosis?
Which therapies can help with strength and joint tightness?
How should the spine and tongue changes be followed?

Quick facts

Symptoms usually startfrom Birth to Childhood
InheritanceAutosomal Recessive
GenesKY

Changes in the KY gene cause this condition. GARD lists autosomal recessive inheritance, meaning a child inherits a changed copy of the gene from each parent.

GeneticNeurological

Also known as: kyphosis, lateral tongue atrophy, myofibrillar myopathy syndrome

Patient organizations

Rare-disease groups that can help

Source: NIH GARD · Kyphosis-lateral tongue atrophy-myofibrillar myopathy syndromeGARD ID 17912 · GARD page updated September 2026 · Plain-language summary by Know Rare; editorial review pending. General information, not medical advice.

You are more than your diagnosis

Perspectives from people navigating life with Kyphosis-lateral tongue atrophy-myofibrillar myopathy syndrome.

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