raremaprare-disease reference indexOrphadata 2026-06-23 · HPO 2026-09-01
ORPHA:99965

O'Sullivan-McLeod syndrome

Type
Disease
Group
Disorder
Age of onset
Adult
Status
active

A rare acquired motor neuron disease characterized by an initial unilateral weakness in the intrinsic hand muscles that eventually spreads to the opposite limb (with an asymmetrical distribution) and that has a very slow progression of muscular atrophy over a 20 year period.

1

Names in Orphadata languages

12 of 12 languages
LangNameSynonyms
enO'Sullivan-McLeod syndrome
frSyndrome d'O'Sullivan-McLeod
deO'Sullivan-McLeod-Syndrom
esSíndrome de O'Sullivan-McLeod
itSindrome di O'Sullivan-McLeod
nlSyndroom van O'Sullivan-McLeod
ptSíndrome O'Sullivan-McLeod
plZespół O'Sullivana i McLeoda
csO'Sullivanův-McLeodův syndromO'Sullivan-McLeodův syndrom
ukСиндром ОСаллівана-МакЛеода
zh欧·沙利文-麦克劳德综合征
trO'Sullivan-McLeod sendromu

Definition in:

2

Cross-references

qualifier = Orphanet mapping relation
SourceCodeQualifierICD relationValidation
ICD-10G12.8NTBTattributedvalidated
MONDO0020559Evalidated
UMLSC2721741Evalidated
MedDRA10069682Evalidated

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/families7 casesWorldwideCase(s)Validated30409480[PMID]
Point prevalence<1 / 1 000 000—WorldwideClass onlyValidated30409480[PMID]_ORPHANET

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

14 annotations · validated 2019-07-01
HPOTerm (as annotated by Orphanet)Diagnostic
Very frequent (99-80%)
HP:0003457EMG abnormality
HP:0030237Hand muscle weakness
HP:0008954Intrinsic hand muscle atrophy
HP:0003484Upper limb muscle weakness
Frequent (79-30%)
HP:0006827Atrophy of the spinal cord
HP:0031372Cold paresis
HP:0003444EMG: chronic denervation signs
HP:0002380Fasciculations
HP:0012531Pain
HP:0001337Tremor
Occasional (29-5%)
HP:0010702Increased circulating immunoglobulin concentration
HP:0001880Increased total eosinophil count
Excluded (0%)
HP:0040272Hyperintensity of MRI T2 signal of the spinal cord
HP:0003474Somatic sensory dysfunction

Run the differential on the 4 obligate / very frequent terms

Annotation source: 17443046[PMID]_30409480[PMID]

7

Sources for this card