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Living with Myopathy with hexagonally cross-linked tubular arrays

A rare muscle condition present from birth, with mild, slowly worsening weakness and muscle pain after exercise.

Understanding Myopathy with hexagonally cross-linked tubular arrays

Myopathy with hexagonally cross-linked tubular arrays is a rare, mild muscle condition present from birth that slowly gets worse.

It mainly affects muscles near the center of the body. People have trouble with exercise and muscle pain after exercise, without serious muscle breakdown. A muscle biopsy shows highly organized, hexagon-shaped tube patterns. Other features may include muscle shrinking, weakness in the trunk and hip and shoulder muscles, and tight joints.

Signs & symptoms

GARD doesn't list specific symptoms, but the summary describes these features:

  • Trouble with exercise (exercise intolerance)
  • Muscle pain after exercise
  • Muscle weakness near the center of the body
  • Muscle shrinking (atrophy)
  • Mild drooping of the eyelids
  • Tight joints (contractures)

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. Ask which tests can help

    Your care team will decide which exams and tests can confirm the diagnosis.

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
Is genetic testing available to find the cause?
How much exercise is safe for me?
Which therapies can help with muscle pain and weakness?

Quick facts

GARD says changes in genes cause this condition. It doesn't list a specific gene or how it is inherited.

GeneticNeurological

Patient organizations

Rare-disease groups that can help

Source: NIH GARD · Myopathy with hexagonally cross-linked tubular arraysGARD ID 20129 · 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 Myopathy with hexagonally cross-linked tubular arrays.

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