raremaprare-disease reference indexOrphadata 2026-06-23 · HPO 2026-09-01
ORPHA:611

Inclusion body myositis

Synonyms: IBM · Sporadic inclusion body myositis · sIBM

Type
Disease
Group
Disorder
Inheritance
Not applicable
Age of onset
Adult, Elderly
Status
active

A rare degenerative inflammatory disorder of skeletal muscles characterized by late onset weakness, starting in either the quadriceps or finger flexors and slowly progressing to include other groups of limb muscles. Distinctive histopathological features include inflammatory and degenerative features.

1

Names in Orphadata languages

12 of 12 languages
LangNameSynonyms
enInclusion body myositisIBM · Sporadic inclusion body myositis · sIBM
frMyosite à inclusionsIBM · Myosite à inclusions sporadique · sIBM
deEinschlusskörper-MyositisEinschlusskörper-Myositis, sporadische · IBM · sIBM
esMiositis por cuerpos de inclusiónIBM · Miositis por cuerpos de inclusión esporádica · sIBM
itMiosite da corpi di inclusioneIBM · Miosite sporadica da corpi di inclusione · sIBM
nlInclusielichaammyositisIBM · Inclusion body myositis · Sporadische inclusielichaammyositis · Sporadische inclusion body myositis · sIBM
ptMiosite de corpos de inclusão
plWtrętowe zapalenie mięśniIBM · sIBM · Sporadyczne wtrętowe zapalenie mięśni
csMyozitida s inkluzními tělískyIBM · sIBM · Sporadická myozitida s inkluzními tělísky
ukМіозит зі включеними тільцямиIBM · sIBM · Спорадичний інфільтративний міозит тіла
zh包涵体肌炎散发性包涵体肌炎
trİnklüzyon cisimcik miyozitiIBM · sIBM · Sporadik inklüzyon cisimcikli miyoziti

Definition in:

2

Cross-references

qualifier = Orphanet mapping relation
SourceCodeQualifierICD relationValidation
OMIM147421Evalidated
ICD-10M60.8NTBTattributedvalidated
ICD-114A41.20NTBTindexvalidated
MONDO0007827Evalidated
MeSHD018979Evalidated
UMLSC0238190Evalidated
GARD3896Evalidated
MedDRA10066407Evalidated

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

0 direct

Orphanet records no gene directly on this code.

5

Prevalence and incidence

7 records
TypeClassValueAreaQualificationValidationSource
Point prevalence1-9 / 1 000 0000.5 / 100 000EuropeValue and classValidatedEuropean Medicines Agency 2012[OTHER]
Annual incidence1-9 / 1 000 0002.5 / 100 000SwedenValue and classValidated35596584[PMID]
Point prevalence1-9 / 1 000 0000.49 / 100 000NetherlandsValue and classValidated11087787[PMID]
Point prevalence1-9 / 100 0001.2 / 100 000AustraliaValue and classNot yet validated10842277[PMID]_18815046[PMID]_ ORPHANET
Point prevalence1-9 / 100 0001.1 / 100 000United StatesValue and classValidated11552086[PMID]
Point prevalence1-9 / 1 000 0000.1 / 100 000TurkeyValue and classValidated21842592[PMID]
Point prevalence1-9 / 100 0003.2 / 100 000SwedenValue and classValidated35596584[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

14 annotations · validated 2016-06-01
HPOTerm (as annotated by Orphanet)Diagnostic
Very frequent (99-80%)
HP:0004303Abnormal muscle fiber morphology
HP:0002960Autoimmunity
HP:0003457EMG abnormality
HP:0003236Elevated circulating creatine kinase concentration
HP:0009071Inflammatory myopathy
HP:0003701Proximal muscle weakness
HP:0003731Quadriceps muscle weakness
HP:0003200Ragged-red muscle fibers
HP:0003805Rimmed vacuoles
HP:0003202Skeletal muscle atrophy
Frequent (79-30%)
HP:0034153Anti-cytosolic-5-nucleotidase-1A antibody positivity
HP:0008872Feeding difficulties in infancy
HP:0001315Reduced tendon reflexes
Occasional (29-5%)
HP:0003326Myalgia

Run the differential on the 10 obligate / very frequent terms

7

Sources for this card