raremaprare-disease reference indexOrphadata 2026-06-23 · HPO 2026-09-01
ORPHA:251627

Oligodendroglioma grade 2

Synonyms: Oligodendroglioma

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

A rare glial tumor characterized by a highly cellular lesion that is diffusly infiltrating at the periphery and consists of evenly-spaced monomorphic cells with the oligodendroglial phenotype. It typically occurs in the supratentorial white matter. Histologically, the cells are uniformly round to oval with round nuclei, delicate chromatin and small nucleoli. Most patients present with seizures.

1

Names in Orphadata languages

12 of 12 languages
LangNameSynonyms
enOligodendroglioma grade 2Oligodendroglioma
frOligodendrogliome grade 2Oligodendrogliome
deOligodendrogliom Grad 2Oligodendrogliom
esOligodendroglioma de grado 2= en
itOligodendroglioma
nlOligodendroglioom graad 2Oligodendroglioom
ptOligodendroglioma
plSkąpodrzewiak (Oligodendroglioma)= en
csOligodendrogliom= en
ukОлігодендрогліома
zh少突胶质细胞瘤
trOligodendrogliom

Definition in:

2

Cross-references

qualifier = Orphanet mapping relation
SourceCodeQualifierICD relationValidation
OMIM137800NTBTvalidated
ICD-10C71.9NTBTindexvalidated
ICD-112A00.0YNTBTindexvalidated
ICD-11XH7K31BTNTspecificvalidated
ICD-11XH7W59BTNTspecificvalidated
MONDO0016695Evalidated
MeSHD009837Evalidated
UMLSC0028945Evalidated
GARD9953Evalidated
MedDRA10030286Evalidated

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

2 direct
GeneAssociationStatusHGNCEnsemblOMIMLocusNameSource of validation
IDH2Biomarker tested inAssessedHGNC:5383ENSG0000018205414765015q26.1isocitrate dehydrogenase (NADP(+)) 223681562[PMID]_19228619[PMID]_19554337[PMID]_23109653[PMID]_24149775[PMID]_20714900[PMID]_21075857[PMID]
POT1Major susceptibility factor inAssessedHGNC:17284ENSG000001285136064787q31.33protection of telomeres 125482530[PMID]
5

Prevalence and incidence

1 record
TypeClassValueAreaQualificationValidationSource
Annual incidence1-9 / 1 000 0000.25 / 100 000EuropeValue and classValidatedRARECARE surveillance of rare cancers in Europe[OTHER]

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