raremaprare-disease reference indexOrphadata 2026-06-23 · HPO 2026-09-01
ORPHA:2701

Noonan syndrome-like disorder with loose anagen hair

Synonyms: Mazzanti syndrome · NS/LAH

Type
Malformation syndrome
Group
Disorder
Inheritance
Autosomal dominant
Age of onset
Antenatal, Infancy, Neonatal
Status
active

A Noonan-related syndrome, characterized by facial anomalies suggestive of Noonan syndrome, loose anagen hair, frequent congenital heart defects, distinctive skin features (darkly pigmented skin, keratosis pilaris, eczema or ichthyosis), and short stature that is often associated with a growth hormone deficiency. Psychomotor delay with attention deficit/hyperactivity disorder (ADHD) is frequently observed.

1

Names in Orphadata languages

12 of 12 languages
LangNameSynonyms
enNoonan syndrome-like disorder with loose anagen hairMazzanti syndrome · NS/LAH
frSyndrome Noonan-like avec cheveux anagènes caducsNS/LAH · Syndrome de Mazzanti
deNoonan-ähnliches Syndrom mit losem AnagenhaarNS/LAH · Tosti-Syndrom
esTrastorno de síndrome similar a Noonan con cabello anágeno sueltoNS/LAH · Síndrome de Tosti · Trastorno de síndrome de Noonan-like con cabello anágeno suelto
itSindrome Noonan-simile con capelli caduchi in fase anagenNS/LAH · Sindrome di Tosti
nlSyndroom van Noonan-achtige aandoening met loszittend anageen haarNS/LAH · Syndroom van Mazzanti
ptSíndrome Noonan-like com cabelo em fase anágena soltoSíndrome Noonan-like
plZaburzenie podobne do zespołu Noonan z luźnymi włosami anagenowymiNS/LAH · Zespół Tosti
csPorucha podobná Noonanové syndromu, s řídkými vlasy ve fázi anagenuNS/LAH · Tostiové syndrom
ukЗахворювання, подібне до синдрому Нунана, з випаданням анагенного волоссяСиндром Маццанті · NS/LAH
zhNoonan综合征样异常伴生长期头发松动Tosti综合征
trAnajen saç güçsüzlüğü ile seyreden Noonan sendromu benzeri bozuklukNS / LAH · Tosti sendromu

Definition in:

2

Cross-references

qualifier = Orphanet mapping relation
SourceCodeQualifierICD relationValidation
OMIM607721BTNTvalidated
OMIM617506BTNTvalidated
ICD-10Q87.1NTBTattributedvalidated
ICD-11LD2F.1YNTBTindexvalidated
MONDO0011899Evalidated
UMLSC1843181Evalidated
GARD10719Evalidated

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 (7):

No children.

4

Genes

2 direct
GeneAssociationStatusHGNCEnsemblOMIMLocusNameSource of validation
PPP1CBDisease-causing germline mutation(s) inAssessedHGNC:9282ENSG000002136396005902p23.2protein phosphatase 1 catalytic subunit beta27264673[PMID]_27868344[PMID]_28211982[PMID]
SHOC2Disease-causing germline mutation(s) inAssessedHGNC:15454ENSG0000010806160277510q25.2SHOC2 leucine rich repeat scaffold protein19684605[PMID]
5

Prevalence and incidence

2 records
TypeClassValueAreaQualificationValidationSource
Cases/families70 casesWorldwideCase(s)ValidatedORPHANET
Point prevalence<1 / 1 000 000—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.

6

HPO phenotypes

29 annotations · validated 2016-06-01
HPOTerm (as annotated by Orphanet)Diagnostic
Very frequent (99-80%)
HP:0002750Delayed skeletal maturation
HP:0002162Low posterior hairline
HP:0000358Posteriorly rotated ears
HP:0003196Short nose
HP:0004322Short stature
HP:0002209Sparse scalp hair
HP:0000465Webbed neck
Frequent (79-30%)
HP:0000463Anteverted nares
HP:0100840Aplasia/Hypoplasia of the eyebrow
HP:0002002Deep philtrum
HP:0000286Epicanthus
HP:0000238Hydrocephalus
HP:0001639Hypertrophic cardiomyopathy
HP:0000400Macrotia
HP:0000767Pectus excavatum
HP:0001642Pulmonic stenosis
Occasional (29-5%)
HP:0001231Abnormal fingernail morphology
HP:0005108Abnormal intervertebral disk morphology
HP:0000174Abnormal palate morphology
HP:0009811Abnormality of the elbow
HP:0001156Brachydactyly
HP:0000670Carious teeth
HP:0000028Cryptorchidism
HP:0000365Hearing impairment
HP:0000316Hypertelorism
HP:0001800Hypoplastic toenails
HP:0001249Intellectual disability
HP:0000179Thick lower lip vermilion
HP:0000233Thin vermilion border

Run the differential on the 7 obligate / very frequent terms

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Sources for this card