raremaprare-disease reference indexOrphadata 2026-06-23 · HPO 2026-09-01
ORPHA:1913

Fetal trimethadione syndrome

Type
Malformation syndrome
Group
Disorder
Inheritance
Not applicable
Age of onset
Antenatal, Neonatal
Status
active

A drug-related embryofetopathy that can occur when an embryo/fetus is exposed to trimethadione and that is characterized by pre- and post-natal growth retardation, intellectual deficit, developmental and speech delay, craniofacial anomalies (with some similarities to those seen in fetal valproate syndrome), and less commonly, cleft palate, malformations of the heart, urogenital system and limbs. Trimethadione is an antiepileptic drug that has been removed from the market in Europe and is no longer used much in other countries due to teratogenicity and potential side effects.

1

Names in Orphadata languages

12 of 12 languages
LangNameSynonyms
enFetal trimethadione syndrome
frEmbryopathie à la triméthadioneExposition anténatale à la triméthadione
deTrimethadion-EmbryopathieTrimethadion-Exposition, vorgeburtliche · Trimethadion-Syndrom, fetales
esSíndrome fetal por trimetadionaEmbriopatía por trimetadiona · Exposición fetal a la trimetadiona
itEmbriopatia da trimetadioneEsposizione prenatale al trimetadione
nlFoetaal trimethadionsyndroomAntenatale trimethadioninfectie
ptSíndrome trimetadiona fetalEmbriofetopatia por trimetadiona
plPłodowy zespół trimetadionowy
csFetální trimetadionový syndrom
ukФетальний триметадіоновий синдром
zh胎儿三甲双酮综合征
trFetal trimetadiyon sendromu

Definition in:

2

Cross-references

qualifier = Orphanet mapping relation
SourceCodeQualifierICD relationValidation
ICD-10Q86.8NTBTattributedvalidated
ICD-11LD2F.0YNTBTindexvalidated
MONDO0016009Evalidated
MeSHC537798Evalidated
UMLSC0265373Evalidated

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 (2):

No children.

4

Genes

0 direct

Orphanet records no gene directly on this code.

5

Prevalence and incidence

1 record
TypeClassValueAreaQualificationValidationSource
Point prevalenceUnknown—WorldwideClass onlyNot yet validatedORPHANET

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

26 annotations · validated 2016-06-01
HPOTerm (as annotated by Orphanet)Diagnostic
Very frequent (99-80%)
HP:0011039Abnormal helix morphology
HP:0000248Brachycephaly
HP:0005280Depressed nasal bridge
HP:0000286Epicanthus
HP:0001263Global developmental delay
HP:0001249Intellectual disability
HP:0001511Intrauterine growth retardation
HP:0000369Low-set ears
HP:0000347Micrognathia
HP:0011800Midface retrusion
HP:0000396Overfolded helix
HP:0011220Prominent forehead
HP:0003196Short nose
HP:0000664Synophrys
Frequent (79-30%)
HP:0000062Ambiguous genitalia
HP:0001631Atrial septal defect
HP:0007598Bilateral single transverse palmar creases
HP:0000218High palate
HP:0000047Hypospadias
HP:0000252Microcephaly
HP:0000508Ptosis
HP:0000486Strabismus
HP:0001636Tetralogy of Fallot
HP:0001629Ventricular septal defect
Occasional (29-5%)
HP:0002650Scoliosis
HP:0001669Transposition of the great arteries

Run the differential on the 12 obligate / very frequent terms

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Sources for this card