raremaprare-disease reference indexOrphadata 2026-06-23 · HPO 2026-09-01
ORPHA:1929

Rasmussen syndrome

Synonyms: Rasmussen subacute encephalitis

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

A rare inflammatory and autoimmune disease with epilepsy characterized by unilateral hemispheric atrophy, associated with drug-resistant focal epilepsy, progressive hemiplegia, and cognitive decline. The disease mainly affects children and begins with a prodromal period with mild hemiparesis or infrequent seizures lasting up to several years. The acute stage is marked by frequent seizures arising from one cerebral hemisphere, followed by a residual stage with persistent severe neurological deficits and relapsing epilepsy.

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Names in Orphadata languages

12 of 12 languages
LangNameSynonyms
enRasmussen syndromeRasmussen subacute encephalitis
frSyndrome de RamussenEncéphalite de Rasmussen · Encéphalite focale de Rasmussen
deRasmussen-EnzephalitisRasmussen-Syndrom
esSíndrome de RasmussenEncefalitis subaguda de Rasmussen
itSindrome di RasmussenEncefalite subacuta di Rasmussen
nlSyndroom van RasmussenSubacute encefalitis van Rasmussen
ptEncefalite sub-aguda de RasmussenSíndrome Rasmussen
plPodostre zapalenie mózgu RasmussenaZespół Rasmussena
csRasmussenova subakutní encefalitidaRasmussenův syndrom · Epilepsia partialis continua dětského věku
ukПідгострий енцефаліт РасмуссенаСиндром Расмуссена
zhRasmussen亚急性脑炎Rasmussen综合症
trRasmussen subakut ensefalitiRasmussen sendromu

Definition in:

2

Cross-references

qualifier = Orphanet mapping relation
SourceCodeQualifierICD relationValidation
ICD-10G04.8NTBTindexvalidated
ICD-118A62.YNTBTindexvalidated
MONDO0016019Evalidated
MeSHC535291Evalidated
UMLSC2930868Evalidated
MedDRA10071141Evalidated

E exact · NTBT this ORPHAcode is narrower than the target · BTNT broader than the target · ND not decided.

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Classification

Preferential parent (Orphanet linearisation):

Parents in the classifications (3):

No children.

4

Genes

0 direct

Orphanet records no gene directly on this code.

5

Prevalence and incidence

2 records
TypeClassValueAreaQualificationValidationSource
Cases/families100 casesWorldwideCase(s)ValidatedORPHANET
Point prevalenceUnknown—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.

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HPO phenotypes

48 annotations · validated 2021-01-06
HPOTerm (as annotated by Orphanet)Diagnostic
Very frequent (99-80%)
HP:0007359Focal-onset seizure
HP:0004302Functional motor deficit
Frequent (79-30%)
HP:0002960Autoimmunity
HP:0100308Cerebral cortical hemiatrophy
HP:0100543Cognitive impairment
HP:0011195EEG with focal sharp slow waves
HP:0011193EEG with focal spikes
HP:0012847Epilepsia partialis continua
HP:0002349Focal aware seizure
HP:0002384Focal impaired awareness seizure
HP:0011153Focal motor seizure
HP:0001269Hemiparesis
HP:0004305Involuntary movements
HP:0032665Repeated focal motor seizures
HP:0012157Subcortical cerebral atrophy
HP:0002119Ventriculomegaly
Occasional (29-5%)
HP:0002134Abnormal basal ganglia morphology
HP:0002921Abnormality of the cerebrospinal fluid
HP:0020151Anti-dsDNA antibody positivity
HP:0003493Antinuclear antibody positivity
HP:0002381Aphasia
HP:0007018Attention deficit hyperactivity disorder
HP:0000708Atypical behavior
HP:0007334Bilateral tonic-clonic seizure with focal onset
HP:0025190Bilateral tonic-clonic seizure with generalized onset
HP:0031491Continuous spike and waves during slow sleep
HP:0001260Dysarthria
HP:0100660Dyskinesia
HP:0011185EEG with focal epileptiform discharges
HP:0000712Emotional lability
HP:0032046Focal cortical dysplasia
HP:0010818Generalized tonic seizure
HP:0032005Hemidystonia
HP:0000752Hyperactivity
HP:0002540Inability to walk
HP:0002922Increased CSF protein concentration
HP:0031535Increased theta frequency activity in EEG
HP:0011182Interictal epileptiform activity
HP:0000737Irritability
HP:0002354Memory impairment
HP:0012708Reduced brain N-acetyl aspartate level by MRS
HP:0011163Somatosensory auras
HP:0001328Specific learning disability
HP:0000572Visual loss
Very rare (<4-1%)
HP:0003460Decreased circulating total IgA
HP:0011097Epileptic spasm
HP:0032661Generalized convulsive status epilepticus
HP:0002283Global brain atrophy

Run the differential on the 2 obligate / very frequent terms

Annotation source: 30530407[PMID]_28572051[PMID]

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Sources for this card