raremaprare-disease reference indexOrphadata 2026-06-23 · HPO 2026-09-01
ORPHA:481665

Pseudo-TORCH syndrome type 2

Synonyms: Pseudo-TORCH syndrome due to USP18 deficiency · USP18-related pseudo-TORCH syndrome · PTORCH2 · Pseudo-TORCH syndrome-2

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

A rare genetic neurological disorder characterized by severe pseudo-TORCH syndrome with signs of brain damage and occasionally systemic manifestations resembling the sequelae of congenital infection, but in the absence of an infectious agent. Characteristic features include microcephaly, white matter disease, cerebral atrophy, cerebral hemorrhage, and calcifications, among others. Affected individuals typically have seizures and respiratory insufficiency and die in infancy.

1

Names in Orphadata languages

12 of 12 languages
LangNameSynonyms
enPseudo-TORCH syndrome type 2Pseudo-TORCH syndrome due to USP18 deficiency · USP18-related pseudo-TORCH syndrome · PTORCH2 · Pseudo-TORCH syndrome-2
frSyndrome pseudo-TORCH type 2Syndrome pseudo-TORCH par déficit en USP18 · PTORCH2 · Pseudo-TORCH syndrome-2
dePseudo-Torch-Syndrom Typ 2PTORCH2 · USP18-Mangel · USP18-Defizienz · Pseudo-TORCH-Syndrom durch USP18-Mangel
esSíndrome pseudo-TORCH tipo 2Síndrome pseudo-TORCH por deficiencia de USP18 · Síndrome pseudo-TORCH asociado al gen USP18 · PTORCH2 · Síndrome pseudo-TORCH 2
itSindrome pseudo-TORCH tipo 2PTORCH2 · Sindrome pseudo-TORCH-2 · Sindrome pseudo-TORCH correlata a USP18 · Sindrome pseudo-TORCH da deficit di USP18
nlPseudo-TORCH-syndroom type 2USP18-gerelateerd pseudo-TORCH-syndroom · PTORCH2 · Pseudo-TORCH-syndroom-2 · Pseudo-TORCH-syndroom door USP18-deficiëntie
ptDéfice de UPS18
plZespół pseudo-TORCH typu 2= en
csUSP18 deficit= en
ukДефіцит USP18
zhUSP18缺乏症
trUSP18 eksikliği

Definition in:

2

Cross-references

qualifier = Orphanet mapping relation
SourceCodeQualifierICD relationValidation
OMIM617397Evalidated
ICD-10Q04.8NTBTattributedvalidated
MONDO0018828Evalidated
UMLSC4479376Evalidated

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 (4):

No children.

4

Genes

1 direct
GeneAssociationStatusHGNCEnsemblOMIMLocusNameSource of validation
USP18Disease-causing germline mutation(s) (loss of function) inAssessedHGNC:12616ENSG0000018497960705722q11.21ubiquitin specific peptidase 1827325888[PMID]_27821552[PMID]
5

Prevalence and incidence

2 records
TypeClassValueAreaQualificationValidationSource
Cases/families5 casesWorldwideCase(s)Validated27821552[PMID]_2732588[PMID]
Point prevalence<1 / 1 000 000—WorldwideClass onlyValidatedORPHANET_27821552[PMID]_2732588[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