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- X and Y chromosomal anomaly syndrome
- X chromosome number anomaly syndrome
- X chromosome number anomaly with female phenotype syndrome
- X chromosome number anomaly with male phenotype syndrome
- X small rings syndrome
- X-AIDE
- X-ALD
- X-CALD
- X-LAG
- X-linked acqueductal stenosis
- X-linked acrogigantism
- X-linked adrenal hypoplasia congenita
- X-linked adrenoleukodystrophy
- X-linked agammaglobulinemia
- X-linked AHC
- X-linked ALD
- X-linked alpha-thalassemia-intellectual disability syndrome
- X-linked Alport syndrome
- X-linked Alport syndrome-diffuse leiomyomatosis
- X-linked Angelman-like syndrome
- X-linked anhidrotic ectodermal dysplasia
- X-linked ataxia-deafness syndrome
- X-linked ataxia-dementia syndrome
- X-linked ataxia-hearing loss syndrome
- X-linked auditory neuropathy with peripheral sensory neuropathy type 1
- X-linked autoinflammatory and immunodeficiency disease associated with ELF4
- X-linked branchial arch syndrome
- X-linked BSMA
- X-linked bulbospinal amyotrophy
- X-linked bulbospinal muscular atrophy
- X-linked calvarial hyperostosis
- X-linked cardioskeletal myopathy and neutropenia
- X-linked central congenital hypothyroidism with late-onset macroorchidism
- X-linked central congenital hypothyroidism with late-onset testicular enlargement
- X-linked centronuclear myopathy
- X-linked cerebellar ataxia
- X-linked cerebral adrenoleukodystrophy
- X-linked cerebral-cerebellar-coloboma syndrome
- X-linked Charcot-Marie-Tooth disease
- X-linked Charcot-Marie-Tooth disease type 1
- X-linked Charcot-Marie-Tooth disease type 2
- X-linked Charcot-Marie-Tooth disease type 3
- X-linked Charcot-Marie-Tooth disease type 4
- X-linked Charcot-Marie-Tooth disease type 5
- X-linked Charcot-Marie-Tooth disease type 6
- X-linked chondrodysplasia punctata type 2
- X-linked CID due to SASH3 deficiency
- X-linked cleft palate and ankyloglossia
- X-linked colobomatous microphthalmia-microcephaly-intellectual disability-short stature syndrome
- X-linked colobomatous microphthalmia-microcephaly-short stature-psychomotor retardation syndrome
- X-linked combined immunodeficiency due to SASH3 deficiency
- X-linked common variable immunodeficiency phenotype due to SH3-domain kinase-binding protein 1 deficiency
- X-linked common variable immunodeficiency phenotype due to SH3KBP1 deficiency
- X-linked complex spastic paraplegia
- X-linked complicated corpus callosum dysgenesis
- X-linked complicated spastic paraplegia
- X-linked complicated spastic paraplegia type 1
- X-linked cone dysfunction syndrome with myopia
- X-linked congenital adrenal hypoplasia
- X-linked congenital dyserythropoietic anemia with thrombocytopenia
- X-linked congenital generalized hypertrichosis
- X-linked corneal dermoid
- X-linked creatine transporter deficiency
- X-linked cutaneous amyloidosis
- X-linked CVID phenotype due to SH3KBP1 deficiency
- X-linked deafness-intellectual disability syndrome
- X-linked dHMN
- X-linked dHMN3
- X-linked distal arthrogryposis multiplex congenita
- X-linked distal hereditary motor neuropathy
- X-linked distal hereditary motor neuropathy type 3
- X-linked distal spinal muscular atrophy
- X-linked distal spinal muscular atrophy type 3
- X-linked dominant chondrodysplasia punctata
- X-linked dominant chondrodysplasia, Chassaing-Lacombe type
- X-linked dominant chondrodysplasia-hydrocephaly-microphthalmia syndrome
- X-linked dominant erythropoietic protoporphyria
- X-linked dominant protoporphyria
- X-linked dSMA3
- X-linked dyserythropoietic anemia with abnormal platelets and neutropenia
- X-linked dysplasia gigantism syndrome
- X-linked dystonia-parkinsonism
- X-linked EDS
- X-linked Ehlers-Danlos syndrome
- X-linked Emery-Dreifuss muscular dystrophy
- X-linked endothelial corneal dystrophy
- X-linked epilepsy-learning disabilities-behavior disorders syndrome
- X-linked erythropoietic protoporphyria
- X-linked external auditory canal atresia-dilated internal auditory canal-facial dysmorphism syndrome
- X-linked facial dysmorphism-short stature-choanal atresia-intellectual disability syndrome limited to females
- X-linked female restricted facial dysmorphism-short stature-choanal atresia-intellectual disability
- X-linked hearing loss-intellectual disability syndrome
- X-linked hereditary motor and sensory neuropathy
- X-linked hereditary sensory and autonomic neuropathy with deafness
- X-linked hereditary sensory and autonomic neuropathy with hearing loss
- X-linked HSAN with deafness
- X-linked HSAN with hearing loss
- X-linked HSAS
- X-linked hydrocephalus
- X-linked hydrocephalus with stenosis of aqueduct of Sylvius
- X-linked hyper-IgM syndrome
- X-linked hypohidrotic ectodermal dysplasia
- X-linked hypophosphatemia
- X-linked hypophosphatemic rickets
- X-linked ichthyosis
- X-linked ichthyosis syndrome
- X-linked IGHD
- X-linked immune dysregulation with inflammatory bowel disease due to E74 like ETS transcription factor 4 deficiency
- X-linked immune dysregulation with inflammatory bowel disease due to ELF4 deficiency
- X-linked immunodeficiency with magnesium defect, Epstein-Barr virus infection and neoplasia
- X-linked immunoneurologic disorder
- X-linked incomplete achromatopsia
- X-linked intellectual disability due to GRIA3 mutations
- X-linked intellectual disability due to PQBP1 mutations
- X-linked intellectual disability syndrome, Lubs type
- X-linked intellectual disability with isolated growth hormone deficiency
- X-linked intellectual disability with marfanoid habitus
- X-linked intellectual disability, Abidi type
- X-linked intellectual disability, Ahmad type
- X-linked intellectual disability, Armfield type
- X-linked intellectual disability, Atkin type
- X-linked intellectual disability, Cabezas type
- X-linked intellectual disability, Cantagrel type
- X-linked intellectual disability, Cilliers type
- X-linked intellectual disability, Golabi-Ito-Hall type
- X-linked intellectual disability, Hedera type
- X-linked intellectual disability, Kroes type
- X-linked intellectual disability, Miles-Carpenter type
- X-linked intellectual disability, Najm type
- X-linked intellectual disability, Nascimento type
- X-linked intellectual disability, Pai type
- X-linked intellectual disability, Porteous type
- X-linked intellectual disability, Renpenning type
- X-linked intellectual disability, Schimke type
- X-linked intellectual disability, Seemanova type
- X-linked intellectual disability, Shashi type
- X-linked intellectual disability, Shrimpton type
- X-linked intellectual disability, Siderius type
- X-linked intellectual disability, Snyder type
- X-linked intellectual disability, Stevenson type
- X-linked intellectual disability, Stocco Dos Santos type
- X-linked intellectual disability, Stoll type
- X-linked intellectual disability, Sutherland-Haan type
- X-linked intellectual disability, Van Esch type
- X-linked intellectual disability, Wilson type
- X-linked intellectual disability-acromegaly-hyperactivity syndrome
- X-linked intellectual disability-ataxia-apraxia syndrome
- X-linked intellectual disability-cardiomegaly-congestive heart failure syndrome
- X-linked intellectual disability-cerebellar hypoplasia syndrome
- X-linked intellectual disability-cerebellar hypoplasia-spondylo-epiphyseal dysplasia syndrome
- X-linked intellectual disability-choreoathetosis-abnormal behavior syndrome
- X-linked intellectual disability-craniofacioskeletal syndrome
- X-linked intellectual disability-cubitus valgus-dysmorphism syndrome
- X-linked intellectual disability-Dandy-Walker malformation-basal ganglia disease-seizures syndrome
- X-linked intellectual disability-dysmorphism-cerebral atrophy syndrome
- X-linked intellectual disability-dystonia-dysarthria syndrome
- X-linked intellectual disability-epilepsy syndrome
- X-linked intellectual disability-epilepsy-progressive joint contractures-dysmorphism syndrome
- X-linked intellectual disability-epileptic seizures-hypogenitalism-microcephaly-obesity syndrome
- X-linked intellectual disability-global development delay-facial dysmorphism-sacral caudal remnant syndrome
- X-linked intellectual disability-gynecomastia-obesity syndrome
- X-linked intellectual disability-hypogammaglobulinemia-progressive neurological deterioration syndrome
- X-linked intellectual disability-hypogonadism-ichthyosis-obesity-short stature syndrome
- X-linked intellectual disability-hypotonia syndrome
- X-linked intellectual disability-hypotonia-facial dysmorphism-aggressive behavior syndrome
- X-linked intellectual disability-hypotonia-movement disorder syndrome
- X-linked intellectual disability-limb spasticity-retinal dystrophy-arginine vasopressin deficiency
- X-linked intellectual disability-limb spasticity-retinal dystrophy-diabetes insipidus syndrome
- X-linked intellectual disability-macrocephaly-macroorchidism syndrome
- X-linked intellectual disability-microcephaly-cortical malformation-thin habitus syndrome
- X-linked intellectual disability-microcephaly-pontocerebellar hypoplasia syndrome
- X-linked intellectual disability-microcephaly-testicular failure syndrome
- X-linked intellectual disability-nail dystrophy-seizures syndrome
- X-linked intellectual disability-plagiocephaly syndrome
- X-linked intellectual disability-psychosis-macroorchidism syndrome
- X-linked intellectual disability-retinitis pigmentosa syndrome
- X-linked intellectual disability-seizures-psoriasis syndrome
- X-linked intellectual disability-short stature-overweight syndrome
- X-linked isolated growth hormone deficiency
- X-linked isolated neurosensory deafness type DFN
- X-linked isolated neurosensory hearing loss type DFN
- X-linked isolated sensorineural deafness type DFN
- X-linked isolated sensorineural hearing loss type DFN
- X-linked juvenile retinoschisis
- X-linked keloid scarring-reduced joint mobility-increased optic cup-to-disc ratio syndrome
- X-linked lethal multiple pterygium syndrome
- X-linked lissencephaly type 1
- X-linked lissencephaly with abnormal genitalia
- X-linked lissencephaly with ambiguous genitalia
- X-linked lissencephaly-corpus callosum agenesis-genital anomalies syndrome
- X-linked lymphoproliferative disease
- X-linked lymphoproliferative disease due to SAP deficiency
- X-linked lymphoproliferative disease due to SH2 domain containing 1A protein deficiency
- X-linked lymphoproliferative disease due to SH2D1A deficiency
- X-linked lymphoproliferative disease due to Signaling lymphocyte activation molecule-associated protein deficiency
- X-linked lymphoproliferative disease due to XIAP deficiency
- X-linked lymphoproliferative syndrome type 1
- X-linked lymphoproliferative syndrome type 2
- X-linked mandibulofacial dysostosis
- X-linked mandibulofacial dysostosis with limb anomalies
- X-linked McLeod syndrome
- X-linked mendelian susceptibility to mycobacterial diseases
- X-linked mendelian susceptibility to mycobacterial diseases due to CYBB deficiency
- X-linked mendelian susceptibility to mycobacterial diseases due to IKBKG deficiency
- X-linked mendelian susceptibility to mycobacterial diseases due to NEMO deficiency
- X-linked microcephaly-growth retardation-prognathism-cryptorchidism syndrome
- X-linked Moesin-associated immunodeficiency
- X-linked MSMD
- X-linked MSMD due to CYBB deficiency
- X-linked MSMD due to IKBKG deficiency
- X-linked MSMD due to NEMO deficiency
- X-linked myopathy with excessive autophagy
- X-linked myopathy with postural muscle atrophy
- X-linked myotubular myopathy
- X-linked myotubular myopathy-abnormal genitalia syndrome
- X-linked neurodegenerative syndrome, Bertini type
- X-linked neurodegenerative syndrome, Hamel type
- X-linked non progressive cerebellar ataxia
- X-linked non-syndromic intellectual disability
- X-linked non-syndromic neurosensory deafness type DFN
- X-linked non-syndromic neurosensory hearing loss type DFN
- X-linked non-syndromic sensorineural hearing loss type DFN
- X-linked Ohdo syndrome
- X-linked osteoporosis with fractures
- X-linked parkinsonism-spasticity syndrome
- X-linked progressive cerebellar ataxia
- X-linked pure spastic paraplegia
- X-linked recessive hypercalciuric hypophosphatemic rickets
- X-linked recessive nephrolithiasis
- X-linked recessive ocular albinism
- X-linked reticulate pigmentary disorder
- X-linked retinal dysplasia
- X-linked retinoschisis
- X-linked scapuloperoneal muscular dystrophy
- X-linked scapuloperoneal syndrome
- X-linked severe congenital neutropenia
- X-linked severe syndromic TAAD
- X-linked severe syndromic thoracic aortic aneurysm and dissection
- X-linked sideroblastic anemia
- X-linked sideroblastic anemia and spinocerebellar ataxia
- X-linked sideroblastic anemia with ataxia
- X-linked skeletal dysplasia-intellectual disability syndrome
- X-linked spastic paraplegia type 16
- X-linked spastic paraplegia type 2
- X-linked spastic paraplegia type 34
- X-linked spasticity-intellectual disability-epilepsy syndrome
- X-linked spinal and bulbar muscular atrophy
- X-linked spinal muscular atrophy type 2
- X-linked spinal muscular atrophy with respiratory distress
- X-linked spinocerebellar ataxia type 3
- X-linked spinocerebellar ataxia type 4
- X-linked SPMD
- X-linked spondyloepimetaphyseal dysplasia
- X-linked spondylometaphyseal dysplasia
- X-linked thrombocytopenia with normal platelets
- Xanthic urolithiasis
- Xanthine dehydrogenase and xanthine aldehyde oxidase dual deficiency
- Xanthine dehydrogenase deficiency
- Xanthine oxidase deficiency
- Xanthine oxidoreductase deficiency
- Xanthine stone disease
- Xanthinuria type I
- Xanthinuria type II
- Xanthoma disseminatum
- Xanthous oculocutaneous albinism
- Xanthurenic aciduria
- XDAT
- XDH and AOX dual deficiency
- XDH deficiency
- XDP
- XECD
- Xeroderma pigmentosum
- Xeroderma pigmentosum variant
- Xeroderma pigmentosum-Cockayne syndrome complex
- XHED
- XHIGM
- Xia-Gibbs syndrome
- XIAP deficiency syndrome
- XK aprosencephaly syndrome
- XK syndrome
- XK-aprosencephaly
- XLAG (X-linked lissencephaly with abnormal genitalia) syndrome
- XLCNM
- XLDPP
- XLG
- XLH
- XLI
- XLMTM
- XLOA
- XLP
- XLP1
- XLP2
- XLPDR
- XLPP
- XLRS
- XLSA
- XLSA-A
- XLTT
- XMEA
- XMEN
- XMPMA
- XO deficiency
- XOR deficiency
- XP/CS complex
- Xp21 contiguous gene deletion syndrome
- Xp21 deletion syndrome
- Xp21 microdeletion syndrome
- Xp22.13p22.2 duplication syndrome
- Xp22.3 microdeletion syndrome
- XPDS
- XPV
- Xq12-q13.3 duplication syndrome
- Xq21 microdeletion syndrome
- Xq22.3 microdeletion syndrome
- Xq25 microduplication syndrome
- Xq25 microtriplication
- Xq27.3-q28 microduplication syndrome
- Xq27.3q28 duplication syndrome
- Xq28 contiguous gene deletion syndrome
- XX female gonadal dysgenesis
- XX gonadal dysgenesis-deafness syndrome
- XX gonadal dysgenesis-deafness syndrome-progressive neurological manifestations
- XX gonadal dysgenesis-deafness syndrome-without neurological manifestations
- XX gonadal dysgenesis-hearing loss syndrome
- XX, male syndrome
- XX-GD
- XXX syndrome
- XY gonadal agenesis syndrome
- XY sex reversal-adrenal failure
- XY type gonadal dysgenesis-associated anomalies syndrome
- Xylitol dehydrogenase deficiency
- XYLT1-CDG
- XYY syndrome