raremaprare-disease reference indexOrphadata 2026-06-23 · HPO 2026-09-01
ORPHA:48918

Focal myositis

Synonyms: Focal nodular myositis · Inflammatory pseudotumor of skeletal muscle

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

A rare idiopathic inflammatory myopathy characterized by a localized swelling of skeletal muscle that is usually located in the lower extremities.

1

Names in Orphadata languages

12 of 12 languages
LangNameSynonyms
enFocal myositisFocal nodular myositis · Inflammatory pseudotumor of skeletal muscle
frMyosite focaleMyosite focale nodulaire · Pseudotumeur inflammatoire des muscles squelettiques
deMyositis, fokaleInflammatorischer Pseudotumor der Skelettmuskulatur · Myositis, fokale noduläre
esMiositis focalMiositis focal nodular · Pseudotumor inflamatorio del músculo esquelético
itMiosite focaleMiosite nodulare focale · Pseudotumore infiammatorio del muscolo scheletrico
nlFocale myositisFocale nodulaire myositis · Inflammatoire pseudotumor van skeletspier
ptMiosite focal
plOgniskowe zapalenie mięśniOgniskowe guzkowe zapalenie mięśni · Zapalny pseudoguz mięśnia szkieletowego
csFokální myozitidaFokální nodulární myozitida · Zánětlivý pseudonádor kosterního svalstva
ukФокальний міозитВогнищевий вузликовий міозит · Запальна псевдопухлина скелетних мязів
zh局灶性肌炎骨骼肌炎性假瘤
trOdak miyozitFokal nodüler miyozit · İskelet kasının inflamatuar psödotümörü

Definition in:

2

Cross-references

qualifier = Orphanet mapping relation
SourceCodeQualifierICD relationValidation
ICD-10M60.8NTBTattributedvalidated
ICD-114A41.YNTBTindexvalidated
MONDO0018845Evalidated
UMLSC0751357Evalidated
MedDRA10081943Evalidated

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

2 records
TypeClassValueAreaQualificationValidationSource
Cases/families115 casesWorldwideCase(s)Validated15546587[PMID]
Point prevalence<1 / 1 000 000—WorldwideClass onlyValidatedORPHANET

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

7 annotations · validated 2016-06-01
HPOTerm (as annotated by Orphanet)Diagnostic
Very frequent (99-80%)
HP:0100614Myositis
Frequent (79-30%)
HP:0003236Elevated circulating creatine kinase concentration
Occasional (29-5%)
HP:0001945Fever
HP:0001376Limitation of joint mobility
HP:0001324Muscle weakness
HP:0003326Myalgia
HP:0001824Weight loss

Run the differential on the 1 obligate / very frequent terms

7

Sources for this card