raremaprare-disease reference indexOrphadata 2026-06-23 · HPO 2026-09-01
ORPHA:93926

Midline interhemispheric variant of holoprosencephaly

Synonyms: MIH · MIH type HPE · MIHF · MIHV · Middle interhemispheric fusion variant · Middle interhemispheric variant of holoprosencephaly · Syntelencephaly

Type
Clinical subtype
Group
Subtype of disorder
Inheritance
Multigenic/multifactorial, Not applicable
Age of onset
Infancy, Neonatal
Status
active

Midline interhemispheric variant of holoprosencephaly (MIH) or syntelencephaly is a form of holoprosencephaly (HPE) characterized by non-separation of the posterior frontal and parietal lobes, normally-formed callosal genu and splenium, absence of the callosal body, normally-separated hypothalamus and lentiform nucleus, and frequent heterotopic gray matter.

1

Names in Orphadata languages

12 of 12 languages
LangNameSynonyms
enMidline interhemispheric variant of holoprosencephalyMIH · MIH type HPE · MIHF · MIHV · Middle interhemispheric fusion variant · Middle interhemispheric variant of holoprosencephaly · Syntelencephaly
frVariant interhémisphérique médian de l'holoprosencéphalieMIHV · Syntélencéphalie · MIH · MIH type HPE · MIHF
deMittlere interhemisphärische Fusionsvariante der HoloprosenzephalieMIH · MIH vom Typ HPE · MIHF · MIHV · Mittlere interhemisphärische Fusionsvariante · Syntelenzephalie
esVariante interhemisférica media de la holoprosencefaliaMIH · MIH tipo HPE · MIHF · MIHV · Sintelencefalia · Variante de fusión interhemisférica media
itOloprosencefalia, variante interemisferica della linea medianaHPE, tipo MIH · MIH · MIHF · MIHV · Sintelencefalia · Variante da fusione interemisferica mediana · Variante interemisferica mediana dell'oloprosencefalia
nlMiddellijn interhemisferische variant van holoprosencefalieMIH · MIH type HPE · MIHF · MIHV · Midden interhemisferische fusievariant · Midden interhemisferische variant van holoprosencefalie · Syntelencefalie
ptHoloprosencefalia, variante interhemisférica média
plPośrodkowy międzypółkulowy wariant holoprozencefaliiMIH · MIH typu HPE · MIHF · MIHV · Pośrodkowy międzypółkulowy wariant holoprozencefalii · Syntelencefalia
csInterhemisférická varianta holoprosencefalie ve střední čářeMIH · MIH typ HPE · MIHF · MIHV
ukСерединний міжпівкульний варіант голопрозенцефаліїСередній міжпівкульний варіант злиття · Середній міжпівкульний варіант голопрозенцефалії · MIH · MIH тип HPE · MIHF · MIHV · Синтесенцефалія
zh半球中线变异型前脑无裂畸形前脑无裂畸形半球中央变异型
trHoloprozensefalinin orta hat interhemisferik varyantıMIH · MIHF · MIHV · MIH tip HPE · Sintelensefali · Orta interhemisferik füzyon varyantı · Holoprozensefalinin orta interhemisferik varyantı

Definition in:

2

Cross-references

qualifier = Orphanet mapping relation
SourceCodeQualifierICD relationValidation
OMIM157170NTBTvalidated
OMIM609637NTBTvalidated
OMIM610829NTBTvalidated
ICD-10Q04.2NTBTattributedvalidated
ICD-11LA05.2NTBTindexvalidated
UMLSC5396362Evalidated

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):

  • ORPHA:2162Holoprosencephaly
    rare developmental anomalies during embryogenesis; rare genetic diseases; rare neurological diseases; rare endocrine diseases

No children.

4

Genes

15 direct
GeneAssociationStatusHGNCEnsemblOMIMLocusNameSource of validation
CDONDisease-causing germline mutation(s) inAssessedHGNC:17104ENSG0000006430960870711q24.2cell adhesion associated, oncogene regulated
CRIPTODisease-causing germline mutation(s) inAssessedHGNC:11701ENSG000002411861873953p21.31cripto, EGF-CFC family member
DISP1Disease-causing germline mutation(s) inAssessedHGNC:19711ENSG000001543096075021q41dispatched RND transporter family member 1
DLL1Disease-causing germline mutation(s) inAssessedHGNC:2908ENSG000001987196065826q27delta like canonical Notch ligand 1
FGF8Disease-causing germline mutation(s) inAssessedHGNC:3686ENSG0000010783160048310q24.32fibroblast growth factor 8
FOXH1Disease-causing germline mutation(s) inAssessedHGNC:3814ENSG000001609736036218q24.3forkhead box H1
GAS1Disease-causing germline mutation(s) inAssessedHGNC:4165ENSG000001804471391859q21.33growth arrest specific 1
GLI2Disease-causing germline mutation(s) inAssessedHGNC:4318ENSG000000740471652302q14.2GLI family zinc finger 2
NODALDisease-causing germline mutation(s) inAssessedHGNC:7865ENSG0000015657460126510q22.1nodal growth differentiation factor
PTCH1Disease-causing germline mutation(s) inAssessedHGNC:9585ENSG000001859206013099q22.32patched 1
SHHDisease-causing germline mutation(s) inAssessedHGNC:10848ENSG000001646906007257q36.3sonic hedgehog signaling molecule
SIX3Disease-causing germline mutation(s) inAssessedHGNC:10889ENSG000001380836037142p21SIX homeobox 3
STILDisease-causing germline mutation(s) inAssessedHGNC:10879ENSG000001234731815901p33STIL centriolar assembly protein29785796[PMID]
TGIF1Disease-causing germline mutation(s) inAssessedHGNC:11776ENSG0000017742660263018p11.31TGFB induced factor homeobox 1
ZIC2Disease-causing germline mutation(s) inAssessedHGNC:12873ENSG0000004335560307313q32.3Zic family zinc finger 2
5

Prevalence and incidence

3 records
TypeClassValueAreaQualificationValidationSource
Point prevalenceUnknown—WorldwideClass onlyValidated31063520[PMID]_ORPHANET
Prevalence at birth1-9 / 100 000—WorldwideClass onlyValidated31063520[PMID]_ORPHANET
Prevalence at birth1-9 / 100 0002.778 / 100 000RomaniaValue and classValidated31063520[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.

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HPO phenotypes

72 annotations · validated 2020-06-09
HPOTerm (as annotated by Orphanet)Diagnostic
Very frequent (99-80%)
HP:0000478Abnormality of the eye
HP:0001508Failure to thrive
HP:0011968Feeding difficulties
HP:0001510Growth delay
HP:0000601Hypotelorism
HP:0002033Poor suck
HP:0004322Short stature
Frequent (79-30%)
HP:0002363Abnormal brainstem morphology
HP:0012285Abnormal hypothalamus physiology
HP:0040327Abnormal morphology of the olfactory bulb
HP:0002793Abnormal pattern of respiration
HP:0011442Abnormality of central motor function
HP:0002270Abnormality of the autonomic nervous system
HP:0001344Absent speech
HP:0000739Anxiety
HP:0000741Apathy
HP:0010654Aplasia of the falx cerebri
HP:0011951Aspiration pneumonia
HP:0007018Attention deficit hyperactivity disorder
HP:0000708Atypical behavior
HP:0000193Bifid uvula
HP:0002871Central apnea
HP:0100704Cerebral visual impairment
HP:0006528Chronic lung disease
HP:0000175Cleft palate
HP:0002019Constipation
HP:0000457Depressed nasal ridge
HP:0000716Depression
HP:0002015Dysphagia
HP:0008947Floppy infant
HP:0002020Gastroesophageal reflux
HP:0000218High palate
HP:0002540Inability to walk
HP:0001249Intellectual disability
HP:0000737Irritability
HP:0001254Lethargy
HP:0002451Limb dystonia
HP:0000161Median cleft lip
HP:0000252Microcephaly
HP:0045005Neural tube defect
HP:0007301Oromotor apraxia
HP:0001250Seizure
HP:0000407Sensorineural hearing impairment
HP:0006979Sleep-wake cycle disturbance
HP:0001257Spasticity
HP:0001328Specific learning disability
HP:0005968Temperature instability
HP:0002013Vomiting
Occasional (29-5%)
HP:0001627Abnormal heart morphology
HP:0031860Abnormal heart rate variability
HP:0040064Abnormality of limbs
HP:0000818Abnormality of the endocrine system
HP:0000119Abnormality of the genitourinary system
HP:0000924Abnormality of the skeletal system
HP:0001274Agenesis of corpus callosum
HP:0008936Axial hypotonia
HP:0011787Central hypothyroidism
HP:0009914Cyclopia
HP:0000824Decreased response to growth hormone stimulation test
HP:0000873Diabetes insipidus
HP:0001371Flexion contracture
HP:0011471Gastrostomy tube feeding in infancy
HP:0002827Hip dislocation
HP:0000238Hydrocephalus
HP:0000256Macrocephaly
HP:0012718Morphological abnormality of the gastrointestinal tract
HP:0000871Panhypopituitarism
HP:0002465Poor speech
HP:0012806Proboscis
HP:0002650Scoliosis
HP:0006315Single median maxillary incisor
HP:0009932Single naris

Run the differential on the 7 obligate / very frequent terms

Annotation source: 30182446[PMID]_20301702[PMID]_30182444[PMID]

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Sources for this card