National Center for Advancing and Translational Sciences Genetic and Rare Diseases Information Center, a program of the National Center for Advancing and Translational Sciences

Leukoencephalopathy-spondylometaphyseal dysplasia syndrome



Other Names:
H-SMD; Hypomyelination-spondylometaphyseal dysplasia syndrome; Leukoencephalopathy-metaphyseal chondrodysplasia syndrome; H-SMD; Hypomyelination-spondylometaphyseal dysplasia syndrome; Leukoencephalopathy-metaphyseal chondrodysplasia syndrome; X-linked spondyloepimetaphyseal dysplasia with hypomyelinating leukodystrophy (SEMDHL) See More
Categories:

The following summary is from Orphanet, a European reference portal for information on rare diseases and orphan drugs.
orphanet

Orpha Number: 83629

Definition
A rare genetic neurological disorder characterized by the association of hypomyelinating leukodystrophy with spondylometaphyseal dysplasia. Patients present in infancy with absent or delayed ability to walk independently, slowly progressive motor deterioration, spasticity, ataxia, proximal weakness, and joint contractures. Additional manifestations include mild cognitive impairment, short stature, scoliosis, enlarged and deformed joints, dysarthria, nystagmus, visual defects, and mildly dysmorphic features, among others. Mode of inheritance is X-linked recessive.

Visit the Orphanet disease page for more resources.
Last updated: 12/1/2019

This table lists symptoms that people with this disease may have. For most diseases, symptoms will vary from person to person. People with the same disease may not have all the symptoms listed. This information comes from a database called the Human Phenotype Ontology (HPO) . The HPO collects information on symptoms that have been described in medical resources. The HPO is updated regularly. Use the HPO ID to access more in-depth information about a symptom.

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Medical Terms Other Names
Learn More:
HPO ID
80%-99% of people have these symptoms
Leukoencephalopathy 0002352
Metaphyseal chondrodysplasia 0005871
30%-79% of people have these symptoms
Abnormal brainstem MRI signal intensity 0012747
Abnormality of the astrocytes 0100707
Abnormality of the optic nerve
Optic nerve issue
0000587
Babinski sign 0003487
Cerebral atrophy
Degeneration of cerebrum
0002059
Enlargement of the wrists 0003020
Hyperreflexia
Increased reflexes
0001347
Hypoplasia of the corpus callosum
Underdevelopment of part of brain called corpus callosum
0002079
Intellectual disability
Mental deficiency
Mental retardation
Mental retardation, nonspecific
Mental-retardation
[ more ]
0001249
Large knee 0030866
Morphological abnormality of the pyramidal tract 0002062
Reduced bone mineral density
Low solidness and mass of the bones
0004349
Spastic paraplegia 0001258
Toe walking
Toe-walking
0040083
Tremor 0001337
Visual impairment
Impaired vision
Loss of eyesight
Poor vision
[ more ]
0000505
5%-29% of people have these symptoms
Anteverted nares
Nasal tip, upturned
Upturned nasal tip
Upturned nose
Upturned nostrils
[ more ]
0000463
Depressed nasal bridge
Depressed bridge of nose
Flat bridge of nose
Flat nasal bridge
Flat, nasal bridge
Flattened nasal bridge
Low nasal bridge
Low nasal root
[ more ]
0005280
Horizontal nystagmus 0000666
Midface retrusion
Decreased size of midface
Midface deficiency
Underdevelopment of midface
[ more ]
0011800
Percent of people who have these symptoms is not available through HPO
Anterior rib cupping 0000907
Brachydactyly
Short fingers or toes
0001156
Broad foot
Broad feet
Wide foot
[ more ]
0001769
Broad nasal tip
Broad tip of nose
Broad, upturned nose
Increased breadth of nasal tip
Increased breadth of tip of nose
Increased width of nasal tip
Increased width of tip of nose
Nasal tip, broad
Nasal tip, wide
Wide tip of nose
[ more ]
0000455
Broad palm
Broad hand
Broad hands
Wide palm
[ more ]
0001169
Coarse facial features
Coarse facial appearance
0000280
Cone-shaped capital femoral epiphysis
Cone-shaped end part of innermost thighbone
0008789
Coxa vara 0002812
Delayed CNS myelination 0002188
Delayed skeletal maturation
Delayed bone maturation
Delayed skeletal development
[ more ]
0002750
Flared iliac wings 0002869
Flexion contracture
Flexed joint that cannot be straightened
0001371
High palate
Elevated palate
Increased palatal height
[ more ]
0000218
Hypertelorism
Wide-set eyes
Widely spaced eyes
[ more ]
0000316
Hypoplasia of the odontoid process 0003311
Intellectual disability, progressive
Mental retardation, progressive
Progressive mental retardation
[ more ]
0006887
Low anterior hairline
Low frontal hairline
Low-set frontal hairline
[ more ]
0000294
Low-set ears
Low set ears
Lowset ears
[ more ]
0000369
Malar flattening
Zygomatic flattening
0000272
Metaphyseal cupping of metacarpals
Cupping of wide portion of long bone of hand
0006028
Metaphyseal widening
Broad wide portion of long bone
0003016
Optic disc pallor 0000543
Peg-like central prominence of distal tibial metaphyses 0006423
Platyspondyly
Flattened vertebrae
0000926
Prominent sternum 0000884
Seizure 0001250
Short femoral neck
Short neck of thighbone
0100864
Short finger
Stubby finger
0009381
Short neck
Decreased length of neck
0000470
Short stature
Decreased body height
Small stature
[ more ]
0004322
Small epiphyses
Small end part of bone
0010585
Spondyloepimetaphyseal dysplasia 0002651
Thick eyebrow
Bushy eyebrows
Dense eyebrow
Heavy eyebrows
Prominent eyebrows
Thick eyebrows
[ more ]
0000574
Thin ribs
Slender ribs
0000883
Thoracic kyphosis 0002942
Widened subarachnoid space 0012704
Wormian bones
Extra bones within cranial sutures
0002645
X-linked recessive inheritance 0001419
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Last updated: 7/1/2020

If you need medical advice, you can look for doctors or other healthcare professionals who have experience with this disease. You may find these specialists through advocacy organizations, clinical trials, or articles published in medical journals. You may also want to contact a university or tertiary medical center in your area, because these centers tend to see more complex cases and have the latest technology and treatments.

If you can’t find a specialist in your local area, try contacting national or international specialists. They may be able to refer you to someone they know through conferences or research efforts. Some specialists may be willing to consult with you or your local doctors over the phone or by email if you can't travel to them for care.

You can find more tips in our guide, How to Find a Disease Specialist. We also encourage you to explore the rest of this page to find resources that can help you find specialists.

Healthcare Resources


Research helps us better understand diseases and can lead to advances in diagnosis and treatment. This section provides resources to help you learn about medical research and ways to get involved.

Clinical Research Resources

  • The U.S. National Institutes of Health, through the National Library of Medicine, developed ClinicalTrials.gov to provide patients, family members, and members of the public with current information on clinical research studies. There is a study titled Evaluation and Treatment of Skeletal Diseases which may be of interest to you.

Patient Registry

  • A registry supports research by collecting of information about patients that share something in common, such as being diagnosed with Leukoencephalopathy-spondylometaphyseal dysplasia syndrome. The type of data collected can vary from registry to registry and is based on the goals and purpose of that registry. Some registries collect contact information while others collect more detailed medical information. Learn more about registries.

    Registries for Leukoencephalopathy-spondylometaphyseal dysplasia syndrome:
    International Skeletal Dysplasia Registry (ISDR)
     

These resources provide more information about this condition or associated symptoms. The in-depth resources contain medical and scientific language that may be hard to understand. You may want to review these resources with a medical professional.

In-Depth Information

  • The Monarch Initiative brings together data about this condition from humans and other species to help physicians and biomedical researchers. Monarch’s tools are designed to make it easier to compare the signs and symptoms (phenotypes) of different diseases and discover common features. This initiative is a collaboration between several academic institutions across the world and is funded by the National Institutes of Health. Visit the website to explore the biology of this condition.
  • Online Mendelian Inheritance in Man (OMIM) is a catalog of human genes and genetic disorders. Each entry has a summary of related medical articles. It is meant for health care professionals and researchers. OMIM is maintained by Johns Hopkins University School of Medicine. 
  • Orphanet is a European reference portal for information on rare diseases and orphan drugs. Access to this database is free of charge.
  • PubMed is a searchable database of medical literature and lists journal articles that discuss Leukoencephalopathy-spondylometaphyseal dysplasia syndrome. Click on the link to view a sample search on this topic.

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