raremaprare-disease reference indexOrphadata 2026-06-23 · HPO 2026-09-01
ORPHA:357154

Oral submucous fibrosis

Synonyms: OSMF

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

Oral submucous fibrosis (OSMF) is a chronic, progressive disease that alters the fibroelasticity of the oral submucosa, prevalent in India and Southeast Asia but rare elsewhere, and characterized by burning and pain in the oral cavity, loss of gustatory sensation, the presence of blanched fibrous bands and stiffening of the oral mucosa and oro-pharynx (leading to trismus and a progressive reduction in mouth opening) and an increased risk of developing oral squamous cell cancer (3-19%). It is usually associated with the chewing of the areca nut (an ingredient in betel quid) but the exact etiology is unknown and there is currently no effective treatment.

1

Names in Orphadata languages

12 of 12 languages
LangNameSynonyms
enOral submucous fibrosisOSMF
frFibrose buccale sous-muqueuse= en
deOrale submuköse Fibrose= en
esFibrosis submucosa oral= en
itFibrosi orale sottomucosa= en
nlOrale submuceuze fibrose= en
ptFibrose oral submucosa
plZwłóknienie podśluzówkowe jamy ustnej= en
csOrální submukózní fibróza= en
ukПідслизовий фіброз ротової порожнини= en
zh口腔粘膜下纤维性变= en
trOral submukoz fibroz= en

Definition in:

2

Cross-references

qualifier = Orphanet mapping relation
SourceCodeQualifierICD relationValidation
ICD-10K13.5Especificvalidated
ICD-11DA02.2Especificvalidated
MONDO0018166Evalidated
MeSHD009914Evalidated
UMLSC0029172Evalidated
GARD7264Evalidated
MedDRA10031023Evalidated

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

1 record
TypeClassValueAreaQualificationValidationSource
Point prevalenceUnknown—WorldwideClass onlyNot yet validatedORPHANET

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:0000163Abnormal oral cavity morphology
HP:0000600Abnormality of the pharynx
HP:0100825Cheilitis
HP:0000160Narrow mouth
Frequent (79-30%)
HP:0001371Flexion contracture
HP:0000211Trismus
Occasional (29-5%)
HP:0012182Oropharyngeal squamous cell carcinoma

Run the differential on the 4 obligate / very frequent terms

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Sources for this card