raremaprare-disease reference indexOrphadata 2026-06-23 · HPO 2026-09-01
ORPHA:496686

Kyphosis-lateral tongue atrophy-myofibrillar myopathy syndrome

Type
Disease
Group
Disorder
Inheritance
Autosomal recessive
Age of onset
Childhood, Infancy, Neonatal
Status
active

A rare genetic skeletal muscle disease characterized by neonatal to childhood onset of slowly progressive muscle weakness and atrophy primarily affecting the lower limbs, joint contractures, kyphosis or lordosis of the spine, lateral tongue atrophy, and pes equinus. Progression to upper limb involvement, facial weakness, language impairment, intellectual disability, and behavioral abnormalities have been reported in addition. Muscle biopsy shows myopathic changes with increased fiber size variation, internalized nuclei, fiber atrophy, as well as rod structures and core targetoid defects.

1

Names in Orphadata languages

12 of 12 languages
LangNameSynonyms
enKyphosis-lateral tongue atrophy-myofibrillar myopathy syndrome
frSyndrome de cyphose-atrophie de la langue-myopathie myofibrillaire
deKyphose-laterale Zungenatrophie-myofibrilläre Myopathie-Syndrom
esSíndrome de cifosis-atrofia lateral de la lengua-miopatía miofibrilar
itSindrome cifosi-atrofia laterale della lingua-miopatia miofibrillare
nlKyfose - laterale tongatrofie - myofibrillaire myopathie-syndroom
ptSíndrome de cifose-atrofia lateral da língua-miopatia miofibrilar
plZespół kifoskoliozy, bocznego zaniku języka i miopatii miofibrylarnej
csSyndrom kyfózy, laterální atrofie jazyka a myofibrilární myopatie
ukСиндром кіфозу-бічної атрофії язика-міофібрилярної міопатії
zh脊柱后凸-舌单侧萎缩-肌原纤维肌病综合征
trKifoz-lateral dil atrofisi-miyofibriler miyopati sendromu

Definition in:

2

Cross-references

qualifier = Orphanet mapping relation
SourceCodeQualifierICD relationValidation
OMIM617114Evalidated
ICD-10G71.2NTBTattributedvalidated
MONDO0044647Evalidated
UMLSC5567453Evalidated

E exact · NTBT this ORPHAcode is narrower than the target · BTNT broader than the target · ND not decided.

3

Classification

Preferential parent (Orphanet linearisation):

Parents in the classifications (1):

No children.

4

Genes

1 direct
GeneAssociationStatusHGNCEnsemblOMIMLocusNameSource of validation
KYDisease-causing germline mutation(s) inAssessedHGNC:26576ENSG000001746116057393q22.2kyphoscoliosis peptidase27484770[PMID]_27485408[PMID]
5

Prevalence and incidence

2 records
TypeClassValueAreaQualificationValidationSource
Point prevalence<1 / 1 000 000—WorldwideClass onlyValidatedORPHANET_27484770[PMID]_27485408[PMID]
Cases/families3 casesWorldwideCase(s)Validated27484770[PMID]_27485408[PMID]

Value is Orphadata's ValMoy: the mean estimate per 100 000 for prevalence and incidence, the number of cases or families for case reports.

6

HPO phenotypes

Orphanet has no HPO annotation for this code in this release.

7

Sources for this card