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Diseases

Genetic and Rare Diseases Information Center (GARD)

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Miyoshi myopathy


Other Names for this Disease

  • Miyoshi distal myopathy
  • MM
  • Muscular dystrophy, distal, late onset, autosomal recessive
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Symptoms

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What are the signs and symptoms of Miyoshi myopathy?

The onset of signs and symptoms is typically in mid to late childhood or early-adulthood, with an average age at onset of 19 years. Young adults typically have muscle weakness and atrophy (wasting), most marked in the distal parts of the legs, especially the gastrocnemius (calf) and soleus (Achilles tendon) muscles. Early on, affected individuals are not able to stand on tiptoe, but retain the ability to stand on the heels. Over a period of years, the weakness and atrophy spread to the thighs and gluteal muscles, at which time climbing stairs, standing, and walking become difficult. The forearms may become mildly atrophic with decrease in grip strength; the small muscles of the hands are not affected. The weakness may eventually include the shoulder girdle muscles. The weakness and atrophy may be asymmetric (occurring more on one side than the other). Progression of the condition is typically slow.[1]
Last updated: 4/5/2011

The Human Phenotype Ontology provides the following list of signs and symptoms for Miyoshi myopathy. If the information is available, the table below includes how often the symptom is seen in people with this condition. You can use the MedlinePlus Medical Dictionary to look up the definitions for these medical terms.

Signs and Symptoms Approximate number of patients (when available)
Adult onset 75%
Deposits immunoreactive to beta-amyloid protein 5%
Adult onset -
Autosomal recessive inheritance -
Autosomal recessive inheritance -
Decreased Achilles reflex -
Decreased/absent ankle reflexes -
Difficulty climbing stairs -
Difficulty climbing stairs -
Difficulty running -
Distal amyotrophy -
Distal muscle weakness -
Distal muscle weakness -
Elevated serum creatine phosphokinase -
Elevated serum creatine phosphokinase -
Heterogeneous -
Lower limb muscle weakness -
Muscle fibrillation -
Muscular dystrophy -
Quadriceps muscle atrophy -
Variable expressivity -

Last updated: 12/1/2014

The Human Phenotype Ontology (HPO) has collected information on how often a sign or symptom occurs in a condition. Much of this information comes from Orphanet, a European rare disease database. The frequency of a sign or symptom is usually listed as a rough estimate of the percentage of patients who have that feature.

The frequency may also be listed as a fraction. The first number of the fraction is how many people had the symptom, and the second number is the total number of people who were examined in one study. For example, a frequency of 25/25 means that in a study of 25 people all patients were found to have that symptom. Because these frequencies are based on a specific study, the fractions may be different if another group of patients are examined.

Sometimes, no information on frequency is available. In these cases, the sign or symptom may be rare or common.


References
  1. Masashi Aoki. Dysferlinopathy. GeneReviews. April 22, 2010; http://www.ncbi.nlm.nih.gov/books/NBK1303/. Accessed 4/4/2011.


Other Names for this Disease
  • Miyoshi distal myopathy
  • MM
  • Muscular dystrophy, distal, late onset, autosomal recessive
See Disclaimer regarding information on this site. Some links on this page may take you to organizations outside of the National Institutes of Health.