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363235000: Hereditary disorder of nervous system (disorder)

Status: current, Sufficiently defined by necessary conditions definition status (core metadata concept). Date: 31-Jan 2002. Module: SNOMED CT core

Descriptions:

Id Description Lang Type Status Case? Module
482376012 Hereditary disorder of nervous system en Synonym (core metadata concept) Active Entire term case insensitive (core metadata concept) SNOMED CT core
755036018 Hereditary disorder of nervous system (disorder) en Fully specified name Active Entire term case insensitive (core metadata concept) SNOMED CT core
6244341000241113 affection héréditaire du système nerveux fr Synonym (core metadata concept) Active Entire term case insensitive (core metadata concept) SNOMED CT Switzerland NRC maintained Module

1239 descendants. Search Descendants:

Expanded Value Set

Outbound Relationships Type Target Active Characteristic Refinability Group Values
Hereditary disorder of nervous system Is a Hereditary disorder by system true Inferred relationship Some
Hereditary disorder of nervous system Is a Disorder of nervous system (disorder) true Inferred relationship Some
Hereditary disorder of nervous system Finding site Structure of nervous system (body structure) true Inferred relationship Some 1
Inbound Relationships Type Active Source Characteristic Refinability Group
A rare, genetic, non-syndromic cerebral malformation due to abnormal neuronal migration disease characterized by the association of cortical dysplasia and pontocerebellar hypoplasia, manifesting with global developmental delay, mild to severe intellectual disability, axial hypotonia, strabismus, nystagmus and, occasionally, optic nerve hypoplasia. Brain imaging reveals variable malformations, including frontally predominant microgyria, gyral disorganization and simplification, dysmorphic and hypertrophic basal ganglia, cerebellar vermis dysplasia, brainstem/corpus callosum hypoplasia, and/or olfactory bulbs agenesis. Is a True Hereditary disorder of nervous system Inferred relationship Some
A rare, genetic, infantile epilepsy syndrome disease characterized by neonatal- to infancy-onset myoclonic focal seizures occurring in various members of a family, associated in some with mild dysarthria, ataxia and borderline-to-moderate intellectual disability. Is a True Hereditary disorder of nervous system Inferred relationship Some
A rare, genetic, human prion disease characterized by adult-onset neurodegenerative manifestations associated with a movement disorder and psychiatric/behavioral disturbances. Patients typically present personality changes, aggressiveness, manias, anxiety and/or depression in conjunction with rapidly progressive cognitive decline (presenting with dysarthria, apraxia, aphasia, and eventually leading to dementia) as well as ataxia (manifesting with gait disturbances, unsteadiness, coordination problems), Parkinsonism, myoclonus, and/or chorea. Additional features may include generalized spasticity, seizures, urine incontinence and pyramidal abnormalities. Is a False Hereditary disorder of nervous system Inferred relationship Some
A rare, genetic, familial partial epilepsy disease characterized by simple partial seizures, complex partial seizures and/or secondarily generalized seizures, originating from the inner aspect of the temporal lobe, associated with an antecedent history of febrile seizures, occurring in various members of a family. Hippocampal abnormalities (e.g. hippocampal sclerosis) may also be associated. Is a True Hereditary disorder of nervous system Inferred relationship Some
A rare, genetic, familial partial epilepsy disease characterized by focal seizures associated with prominent ictal auditory symptoms, and/or receptive aphasia, presenting in two or more family members and having a relatively benign evolution. Is a True Hereditary disorder of nervous system Inferred relationship Some
A rare, genetic, multiple congenital anomalies/dysmorphic syndrome characterized by severe global developmental delay, hypotonia, and early-onset seizures, associated with multiple congenital anomalies, such as cardiac (e.g. patent foramen ovale, atrial septal defect, patent ductus arteriosus), genitourinary (i.e. hydrocele, renal collecting system dilatation, hydroureter, hydronephrosis, hypertrophic trabecular urinary bladder) and gastrointestinal abnormalities (including gastroesophageal reflux, anal stenosis, imperforate anus, ano-vestibular fistula), as well as facial dysmorphism which includes coarse facies, a prominent occiput, bitemporal narrowing, epicanthal folds, hypertelorism, nystagmus/strabismus/wandering eyes, low-set, large ears with auricle abnormalities, depressed nasal bridge, upturned nose, long philtrum, large, open mouth with thin lips, high-arched palate, and micro/retrognathia. Is a False Hereditary disorder of nervous system Inferred relationship Some
A rare congenital muscular alpha-dystroglycanopathy with brain and eye anomalies disease characterized by a severe muscle-eye-brain disease-like phenotype associated with intellectual disability, muscular dystrophy, macrocephaly and extended bilateral multicystic white matter disease. Is a False Hereditary disorder of nervous system Inferred relationship Some
A rare, genetic, cobblestone lissencephaly disease characterized by the presence of a constellation of brain malformations, including cortical gyral and sulcus anomalies, white matter signal abnormalities, cerebellar dysplasia and brainstem hypoplasia, existing alone or in conjunction with minimal muscular and ocular abnormalities, typically manifesting with severe developmental delay, increased head circumference, hydrocephalus and seizures. Is a True Hereditary disorder of nervous system Inferred relationship Some
A rare, genetic, autosomal recessive cerebellar ataxia disease characterized by nonprogressive cerebellar ataxia, with onset in infancy, manifesting with delayed motor and speech development, gait ataxia, dysmetria, hypotonia, increased deep tendon reflexes, and dysarthria. Additional variable manifestations include moderate nystagmus on lateral gaze, mild spasticity, intention tremor, short stature and pes planus. Brain imaging reveals cerebellar vermis atrophy. Is a False Hereditary disorder of nervous system Inferred relationship Some
A rare, genetic, non-syndromic, obesity disease characterized by severe, early-onset obesity, associated with major hyperphagia and endocrine abnormalities, resulting from leptin receptor deficiency. Is a True Hereditary disorder of nervous system Inferred relationship Some
A rare, X-linked, syndromic intellectual disability disease characterized by neonatal hypertonia which evolves to hypotonia and an exaggerated startle response (to sudden visual, auditory or tactile stimuli), followed by the development of early-onset, frequently refractory, tonic or myoclonic seizures. Progressive epileptic encephalopathy, intellectual disability, and psychomotor development arrest, with subsequent decline, may be additionally associated. Is a True Hereditary disorder of nervous system Inferred relationship Some
Genetically determined myasthenia Is a True Hereditary disorder of nervous system Inferred relationship Some
A rare, genetic, non-dystrophic myopathy disease characterized by childhood-onset severe external ophthalmoplegia, typically without ptosis, associated with mild, very slowly progressive muscular weakness and atrophy, involving the facial, neck flexor and limb (upper > lower, proximal > distal) muscles. Muscle biopsy shows type 1 fiber uniformity, absent, or abnormally small, type 2A fibers, increased variability of fiber size, internalized nuclei and/or fatty infiltration. Is a True Hereditary disorder of nervous system Inferred relationship Some
A rare, genetic, syndromic intellectual disability disease characterized by global developmental delay, microcephaly, mild to moderate intellectual disability, truncal ataxia, trunk and limb, or generalized, choreiform movements, and elevated serum creatine kinase levels. Variably associated features include mild cerebral atrophy, muscular weakness or hypotonia in early childhood, and/or seizures. Ocular abnormalities (e.g. exophoria, anisometropia, amblyopia) have been reported. Is a False Hereditary disorder of nervous system Inferred relationship Some
Amyotonia congenita Is a True Hereditary disorder of nervous system Inferred relationship Some
Huntington's chorea Is a False Hereditary disorder of nervous system Inferred relationship Some
Hereditary degenerative disease of central nervous system Is a True Hereditary disorder of nervous system Inferred relationship Some
Benign hereditary chorea Is a True Hereditary disorder of nervous system Inferred relationship Some
Schwartz-Jampel syndrome Is a True Hereditary disorder of nervous system Inferred relationship Some
Saldino-Mainzer dysplasia Is a False Hereditary disorder of nervous system Inferred relationship Some
Inherited optic neuropathy Is a True Hereditary disorder of nervous system Inferred relationship Some
syndrome de Meretoja Is a False Hereditary disorder of nervous system Inferred relationship Some
Seckel syndrome Is a False Hereditary disorder of nervous system Inferred relationship Some
PPM-X syndrome Is a True Hereditary disorder of nervous system Inferred relationship Some
Hereditary essential tremor Is a True Hereditary disorder of nervous system Inferred relationship Some
Neu-Laxova syndrome (NLS) is a rare, multiple malformation syndrome characterised by severe intrauterine growth retardation (IUGR), severe microcephaly with a sloping forehead, severe ichthyosis (collodion baby type), and facial dysmorphism. Is a False Hereditary disorder of nervous system Inferred relationship Some
RAB18 deficiency causes two disorders with similar signs and symptoms; Warburg micro syndrome and Martsolf syndrome. Both of these diseases are considered to be part of the same disease spectrum because of similar features and shared genetic cause. Manifestations include eye problems from birth including cataracts, microphthalmia and microcornea, intellectual disability, delayed development hypotonia, spasticity and joint contractures. Martsolf syndrome affects the same body systems as Warburg micro syndrome but is usually less severe. RAB18 deficiency is caused by mutations in the RAB3GAP1, RAB3GAP2, RAB18, or TBC1D20 gene. Is a True Hereditary disorder of nervous system Inferred relationship Some
Marinesco-Sjögren syndrome (disorder) Is a False Hereditary disorder of nervous system Inferred relationship Some
Neurofibromatosis type 2 Is a False Hereditary disorder of nervous system Inferred relationship Some
Neurofibromatosis type 1 Is a True Hereditary disorder of nervous system Inferred relationship Some
A rare, genetic, epilepsy syndrome characterized by congenital alopecia, early-onset epilepsy, intellectual disability and speech delay. Large stature, delayed bone development and abnormal electroencephalogram have also been associated. Is a True Hereditary disorder of nervous system Inferred relationship Some
A rare, genetic, neurologic disease characterized by primary hyperaldosteronism presenting with early-onset, severe hypertension, hypokalemia and neurological manifestations (including seizures, severe hypotonia, spasticity, cerebral palsy and profound developmental delay/intellectual disability). Is a True Hereditary disorder of nervous system Inferred relationship Some
Woodhouse-Sakati syndrome is a multisystemic disorder characterized by hypogonadism, alopecia, diabetes mellitus, intellectual deficit and extrapyramidal signs with choreoathetoid movements and dystonia. Is a True Hereditary disorder of nervous system Inferred relationship Some
A rare non-syndromic cerebral malformation due to abnormal neuronal migration characterized by clusters of disorganized neurons in abnormal locations such as periventricular and subcortical. The extent of the lesions ranges from isolated single to bilateral confluent nodules. Pediatric patients typically show variable degrees of developmental delay, intellectual disability, and intractable epilepsy, and concomitant cerebral and/or systemic malformations are frequent. Milder forms may present with onset of seizures in adulthood. Is a True Hereditary disorder of nervous system Inferred relationship Some
A rare genetic, neuro-ophthalmological disease characterized by progressive weakness of the external eye muscles, resulting in bilateral ptosis and diffuse symmetric ophthalmoparesis. Additional signs may include skeletal muscle weakness, cataracts, hearing loss, sensory axonal neuropathy, ataxia, parkinsonism, cardiomyopathy, hypogonadism and depression. It is usually less severe than autosomal recessive form. Is a True Hereditary disorder of nervous system Inferred relationship Some
A rare genetic, neuro-ophthalmological disease characterized by progressive weakness of the external eye muscles, resulting in bilateral ptosis and diffuse, symmetric ophthalmoparesis. Additional signs may include generalized skeletal muscle weakness, muscle atrophy, sensory axonal neuropathy, ataxia, cardiomyopathy, and psychiatric symptoms. It is usually more severe than autosomal dominant form. Is a True Hereditary disorder of nervous system Inferred relationship Some
A rare X-linked cerebellar ataxia, characterized by a combination of upper and lower motor neuron signs, with an age of onset in the first or second decade, slow progression, and normal intelligence. Typical features of cerebellar dysfunction include gait and limb ataxia, intention tremor, dysmetria, dysdiadochokinesia, dysarthria, nystagmus, and hyperreflexia. Further phenotypic features are pes cavus, scoliosis, muscle atrophy, and peripheral sensory and motor nerve abnormalities. Is a False Hereditary disorder of nervous system Inferred relationship Some
Primary inherited reading epilepsy Is a True Hereditary disorder of nervous system Inferred relationship Some
Photomyoclonus, diabetes mellitus, deafness, nephropathy and cerebral dysfunction Is a True Hereditary disorder of nervous system Inferred relationship Some
Neuropathy in association with hereditary ataxia Is a False Hereditary disorder of nervous system Inferred relationship Some
Intellectual disability-myopathy-short stature-endocrine defect syndrome is a rare congenital myopathy syndrome characterized by nonprogressive myopathy (manifesting with mild facial and generalized weakness, bilateral ptosis, and severe lumbar lordosis), severe intellectual disability, short stature, and sexual infantilism (due to hypogonadotropic hypogonadism). The presence of a small pituitary fossa was also noted. There have been no further descriptions in the literature since 1985. Is a True Hereditary disorder of nervous system Inferred relationship Some
Megalencephaly capillary malformation Is a True Hereditary disorder of nervous system Inferred relationship Some
A rare complex overgrowth syndrome characterised by progressive overgrowth of the skeleton, skin, adipose, and central nervous systems. Is a True Hereditary disorder of nervous system Inferred relationship Some
Bilateral frontoparietal polymicrogyria is a sub-type of polymicrogyria. It is a cerebral cortical malformation characterized by excessive cortical folding and abnormal cortical layering, that involves the frontoparietal region of the brain and that presents with hypotonia, developmental delay, moderate to severe intellectual disability, pyramidal signs, epileptic seizures, non progressive cerebellar ataxia, dysconjugate gaze and/or strabismus. Is a True Hereditary disorder of nervous system Inferred relationship Some
Familial spinal neurofibromatosis Is a False Hereditary disorder of nervous system Inferred relationship Some
Type 3 lissencephaly Is a True Hereditary disorder of nervous system Inferred relationship Some
Hereditary ataxia (disorder) Is a True Hereditary disorder of nervous system Inferred relationship Some
Gaucher disease type 2 is the acute neurological form of Gaucher disease. It is characterised by early-onset and severe neurological involvement of the brainstem, associated with an organomegaly and generally leading to death before the age of 2. Is a False Hereditary disorder of nervous system Inferred relationship Some
Syndrome with characteristics of congenital cerebellar hypoplasia, endosteal sclerosis, hypotonia, ataxia, mild to moderate developmental delay, short stature, hip dislocation, and tooth eruption disturbances. It has been described in four patients. Less common manifestations are microcephaly, strabismus, nystagmus, optic atrophy and dysarthria. It is appears to be transmitted as an autosomal recessive trait. Is a True Hereditary disorder of nervous system Inferred relationship Some
A rare oligosaccharidosis characterised by facial dysmorphism, progressive intellectual disability and psychomotor deterioration due to accumulation of glycoasparagines in tissues and body fluids. Is a False Hereditary disorder of nervous system Inferred relationship Some
A lysosomal storage disease with characteristics of coarse facial features, macular cherry red spot, and dysostosis multiplex. Clinical presentation can be heterogeneous ranging from a severe, early-onset, rapidly progressive infantile form to late onset, slowly progressive juvenile/adult form. Is a False Hereditary disorder of nervous system Inferred relationship Some
Choroid plexus carcinoma Is a True Hereditary disorder of nervous system Inferred relationship Some
Autosomal recessive distal hereditary motor neuropathy (disorder) Is a True Hereditary disorder of nervous system Inferred relationship Some
Autosomal dominant distal hereditary motor neuropathy (disorder) Is a True Hereditary disorder of nervous system Inferred relationship Some
X-linked distal hereditary motor neuropathy Is a True Hereditary disorder of nervous system Inferred relationship Some
Nicotinamide adenine dinucleotide coenzyme Q reductase deficiency Is a False Hereditary disorder of nervous system Inferred relationship Some
Encephalopathy-hypertrophic cardiomyopathy-renal tubular disease syndrome is a rare mitochondrial disease due to a defect in coenzyme Q10 biosynthesis that manifests with a broad spectrum of signs and symptoms which may include: neonatal lactic acidosis, global developmental delay, tonus disorder, seizures, reduced spontaneous movements, ventricular hypertrophy, bradycardia, renal tubular dysfunction with massive lactic acid excretion in urine, severe biochemical defect of respiratory chain complexes II/III when assayed together and deficiency of coenzyme Q10 in skeletal muscle. Cerebral and cerebellar atrophy can be seen on magnetic resonance imaging and multiple choroid plexus cysts and symmetrical hyperechoic signal alterations in basal ganglia have been observed on ultrasound. Is a False Hereditary disorder of nervous system Inferred relationship Some
A rare syndromic type of cerebral malformation characterized by aprosencephaly (absence of telencephalon and diencephalon), oculo-facial anomalies (i.e. ocular hypotelorism or cyclopia, malformation/absence of nasal structures, cleft lip), preaxial limb defects (i.e. hypoplastic hands, absent halluces) and various other anomalies including ambiguous genitalia, imperforate anus, and vertebral anomalies. The syndrome is thought to have an autosomal recessive mode of inheritance. Is a True Hereditary disorder of nervous system Inferred relationship Some
Familial porencephaly (disorder) Is a True Hereditary disorder of nervous system Inferred relationship Some
A rare genetic neurological disorder characterized by a pregnancy complicated by polyhydramnios, severe intractable epilepsy presenting in infancy, severe hypotonia, decreased muscle mass, global developmental delay, craniofacial dysmorphism (long face, large forehead, peaked eyebrows, broad nasal bridge, hypertelorism, large mouth with thick lips), and macrocephaly due to megalencephaly and hydrocephalus in most patients. Additional features that have been reported include cardiac anomalies like atrial septal defects, diabetes insipidus, and nephrocalcinosis, among others. Is a True Hereditary disorder of nervous system Inferred relationship Some
A rare genetic lethal multiple congenital anomalies/dysmorphic syndrome characterized by severe hydranencephaly and renal dysplasia or agenesis. Pregnancy is complicated by oligo- or anhydramnios, leading to features of Potter sequence (including typical facies and microretrognathia, limb contractures, talipes equinovarus, and pulmonary hypoplasia) in the fetus. Affected fetuses either die in utero or shortly after birth. Histology of the brain shows widespread presence of multinucleated neurons and glial cells. Is a True Hereditary disorder of nervous system Inferred relationship Some
A rare genetic multiple congenital anomalies/dysmorphic syndrome characterized by global developmental delay, intellectual disability, absent scrotum or labia majora, absent or underdeveloped nipples and a tuft of hair extruding from the lactiferous ducts, bilateral corneal opacities, and dysmorphic craniofacial features (microcephaly, short forehead, and ear abnormalities, among others). Patients also show horizontal nystagmus and ataxic gait. Brain MRI reveals small cerebellar hemispheres and vermis and a small pons. Is a True Hereditary disorder of nervous system Inferred relationship Some
A rare hyperkinetic movement disorder characterized by delayed motor development and infantile onset of axial hypotonia and a generalized hyperkinetic movement disorder, principally with dyskinesia of the limbs and trunk, and facial involvement including orolingual dyskinesia, drooling, and dysarthria. Variable hyperkinetic movements may include a jerky quality, intermittent chorea and ballismus. Brain imaging is normal and cognitive performance is typically preserved. Is a True Hereditary disorder of nervous system Inferred relationship Some
A rare genetic multiple congenital anomalies/dysmorphic syndrome characterized by global developmental delay, intellectual disability, hypotonia, seizures, and autism spectrum disorder. Variable associated features include ophthalmologic anomalies, congenital heart defects, genitourinary defects, and craniofacial dysmorphism (including frontal bossing, epicanthal folds, low-set, posteriorly rotated ears, anteverted nares, and micrognathia). Brain imaging may show thinning of the corpus callosum, white matter abnormalities, ventriculomegaly, and a small cerebellar vermis. Is a True Hereditary disorder of nervous system Inferred relationship Some
A rare genetic multiple congenital anomalies/dysmorphic syndrome characterized by global developmental delay and intellectual disability, infantile hypotonia, microcephaly, movement disorder, and impaired balance. More variable manifestations are hearing loss, cortical visual impairment, abnormalities of fingers and/or toes, congenital cardiac anomalies, kyphoscoliosis, dysmorphic facial features, abnormal sleep pattern, and seizures, among others. Is a True Hereditary disorder of nervous system Inferred relationship Some
TBCK-related intellectual disability syndrome is a rare, genetic, syndromic intellectual disability characterized by usually profound intellectual disability with absent speech, severe infantile hypotonia with decreased or absent reflexes, markedly slow motor development (with no progress beyond the ability to sit independently), early-onset epilepsy, strabismus and post-natal onset of progressive brain atrophy (including loss of brain volume, ex vacuo ventriculomegaly, dysgenesis of corpus callosum, white matter abnormalities ranging from non-specific changes to leukodystrophy). Swallowing difficulties, respiratory insufficiency, osteoporosis and variable craniofacial dysmorphisms (including plagio/brachycephaly, bitemporal narrowing, high-arched eyebrows, high nasal bridge, anteverted nares, high palate, tented upper lip) may constitute additional clinical features. Is a True Hereditary disorder of nervous system Inferred relationship Some
A rare genetic neurological disorder characterized by infantile to childhood onset of global developmental delay, hypotonia, seizures, growth delay, and intellectual disability. Additional variable features include strabismus, cortical visual impairment, nystagmus, movement disorder (such as dystonia, ataxia, or chorea), or mild dysmorphic features, among others. Is a True Hereditary disorder of nervous system Inferred relationship Some
Fried syndrome is a rare X-linked mental retardation (XLMR) syndrome characterized by psychomotor delay, intellectual deficit, hydrocephalus, and mild facial anomalies. Is a True Hereditary disorder of nervous system Inferred relationship Some
A rare genetic motor neuron disease characterized by decreased or absent fetal movements, congenital proximal and distal joint contractures (consistent with arthrogryposis multiplex congenita), and multiple congenital fractures of the long bones. Further manifestations are neonatal respiratory distress, severe muscular hypotonia, areflexia, dysphagia, congenital heart defects, and dysmorphic facial features. Muscle biopsy shows increased fiber-size variation and grouping of larger type I fibers. The disease is usually fatal in infancy due to respiratory failure. Is a True Hereditary disorder of nervous system Inferred relationship Some
A rare X-linked syndromic intellectual disability characterized by intellectual disability of variable degree, behavioral anomalies (including autism, mood disorders, obsessive-compulsive behavior, and hetero- and auto-aggression), and epilepsy. Progressive neurological symptoms like movement disorders and spasticity, as well as subtle dysmorphic features have also been reported. Heterozygous females may be as severely affected as males. Is a True Hereditary disorder of nervous system Inferred relationship Some
Progressive microcephaly-seizures-cortical blindness-developmental delay syndrome is a rare, genetic, neuro-ophthalmological syndrome characterized by post-natal, progressive microcephaly and early-onset seizures, associated with delayed global development, bilateral cortical visual impairment and moderate to severe intellectual disability. Additional manifestations include short stature, generalized hypotonia and pulmonary complications, such as recurrent respiratory infections and bronchiectasis. Auditory and metabolic screenings are normal. Is a True Hereditary disorder of nervous system Inferred relationship Some
X-linked immunoneurologic disorder is characterized by immune deficiency and neurological disorders in females, and by neonatal death in males. Is a True Hereditary disorder of nervous system Inferred relationship Some
A rare genetic multiple congenital anomalies/dysmorphic syndrome characterized by moderate intellectual disability, dysmorphic facial features (such as prominent glabella, synophrys, and prognathism), generalized hirsutism, bilateral single palmar creases, and seizures. Additional reported manifestations include slowly progressive neurological deterioration with muscular weakness and impaired gait and balance, as well as hypogammaglobulinemia with specific absence of plasma and/or secretory IgA, among others. Brain imaging may show mild cerebellar atrophy and thin corpus callosum. Is a True Hereditary disorder of nervous system Inferred relationship Some
Acyl-CoA oxidase deficiency Is a False Hereditary disorder of nervous system Inferred relationship Some
X-linked panhypopituitarism (disorder) Is a True Hereditary disorder of nervous system Inferred relationship Some
A rare genetic cerebral small vessel disease characterized by recurrent ischemic strokes, often with a predilection for the pons, with typical onset in the fourth or fifth decade of life. Patients present progressive cognitive and motor impairment with pyramidal, bulbar, and cerebellar symptoms, among others. Brain imaging shows multiple lacunar infarcts, typically with involvement of the pons, as well as variable leukoencephalopathy of the cerebral hemispheres. Is a True Hereditary disorder of nervous system Inferred relationship Some
A rare inborn error of metabolism characterized by increased serum phenylalanine, associated with variable neurological symptoms ranging from mild autistic features or hyperactivity to severe intellectual disability, dystonia, and parkinsonism. Laboratory analyses show normal tetrahydrobiopterin (BH4) metabolism and low levels of the CSF monoamine neurotransmitter metabolites homovanillic acid and 5-hydroxyindoleacetic acid. Is a True Hereditary disorder of nervous system Inferred relationship Some
Kallmann syndrome with cardiopathy is characterized by hypogonadotropic hypogonadism associated with gonadotropin-releasing hormone (GnRH) deficiency, anosmia or hyposmia (with hypoplasia or aplasia of the olfactory bulbs) and complex congenital cardiac malformations (double-outlet right ventricle, dilated cardiomyopathy, right aortic arch). It represents a distinct clinical entity from Kallmann syndrome. Is a True Hereditary disorder of nervous system Inferred relationship Some
A rare mitochondrial disease characterized by neonatal onset of severe cardiac and/or neurologic signs and symptoms mostly associated with a fatal outcome in the neonatal period or in infancy, although a milder phenotype with later onset and slowly progressive neurologic deterioration has also been reported. Clinical manifestations are variable and include respiratory insufficiency, hypotonia, cardiomyopathy, and seizures. Serum lactate is elevated in most cases. Brain imaging may show cerebellar atrophy or hypoplasia. Is a False Hereditary disorder of nervous system Inferred relationship Some
A rare genetic cerebral small vessel disease characterized by subcortical ischemic events associated with cognitive decline and gait disturbance with an age of onset typically in the sixth or seventh decade of life. Imaging reveals white matter hyperintensities, status cribrosum, lacunar infarcts, and sometimes microbleeds. Extra-neurological manifestations are absent. Is a True Hereditary disorder of nervous system Inferred relationship Some
Hereditary growth hormone deficiency (disorder) Is a True Hereditary disorder of nervous system Inferred relationship Some
A rare genetic multiple congenital anomalies/dysmorphic syndrome characterized by variable developmental delay, intellectual disability, early-onset seizures, and facial dysmorphism (including arched eyebrows, long palpebral fissures, prominent nasal bridge, large ears, thin upper lip, and high arched palate). Other reported features are microcephaly, hypotonia, growth retardation, congenital heart defects, and malformations of the fingers and toes, as well as additional neurologic manifestations (such as ataxia or spastic quadriplegia). Brain imaging may show hypoplastic corpus callosum, white matter abnormalities, or cortical atrophy. Is a True Hereditary disorder of nervous system Inferred relationship Some
A rare, genetic, neurodevelopmental disorder with primordial microcephaly characterized by primary microcephaly, moderate to severe intellectual disability, and global developmental delay. Variable brain malformations are common ranging from simplified gyration, to cortical malformations such as pachygyria, polymicrogyria, reduced sulcation and midline defects. Craniofacial dysmorphism (e.g. sloping forehead, high and broad nasal bridge) are related to the primary microcephaly. Short stature is frequently observed and may be severe. Is a True Hereditary disorder of nervous system Inferred relationship Some
A rare genetic neurological disorder characterized by hypotonia, delayed motor development, dyskinesia of the limbs, intellectual disability with impaired speech development, seizures, autistic features, stereotypic movements, and sleep disturbance. Onset of symptoms is in infancy. Bilateral abnormalities in the putamen on brain MRI have been reported in some patients. Is a True Hereditary disorder of nervous system Inferred relationship Some
A rare multiple congenital anomalies/dysmorphic syndrome with intellectual disability, characterized by macrocephaly, intellectual disability, seizures, dysmorphic facial features (including tall forehead, downslanting palpebral fissures, hypertelorism, depressed nasal bridge, and macrostomia), megalencephaly, and small thorax. Other reported features are umbilical hernia, muscular hypotonia, global developmental delay, autistic behavior, and café-au-lait spots, among others. Is a True Hereditary disorder of nervous system Inferred relationship Some
A rare autosomal ichthyosis syndrome with prominent neurologic signs characterized by the association of congenital ichthyosis with severe developmental delay, microcephaly, spastic tetraplegia, sensorineural hearing impairment, athetosis, and myoclonus. Marked epileptic discharges with occurrence of tonic spasms have also been reported. Cerebral MRI shows diffuse cortical atrophy. There have been no further descriptions in the literature since 1995. Is a True Hereditary disorder of nervous system Inferred relationship Some
A rare genetic cerebral small vessel disease characterized by an adult-onset primary microangiopathy with severe atherosclerosis of arterioles and secondary leukoencephalopathy. Patients may present with migraine, transient ischemic attacks, stroke with central facial palsy, cognitive dysfunction with impaired concentration, dementia, depression, movement disorder, vertigo, dysphagia, dysarthria, sicca syndrome, impaired REM sleep, and therapy-resistant hypertension, among others. Brain MRI typically shows a leukoencephalopathy that is disproportionately severe and extensive compared to the clinical disease. Is a True Hereditary disorder of nervous system Inferred relationship Some
A rare genetic neurological disorder characterized by neonatal onset of rigidity and intractable seizures, with episodic jerking already beginning in utero. Affected infants have small heads, remain visually inattentive, do not feed independently, and make no developmental progress. Frequent spontaneous apnea and bradycardia usually culminate in cardiopulmonary arrest and death in infancy, although some cases were described with a milder clinical course and survival into childhood. Is a True Hereditary disorder of nervous system Inferred relationship Some
A neurodegenerative disease with characteristics of progressive muscular paralysis reflecting degeneration of motor neurons in the primary motor cortex, corticospinal tracts, brainstem and spinal cord. Associated with mutations in the superoxide dismutase-1 gene (SOD1) on chromosome 21q22. Is a True Hereditary disorder of nervous system Inferred relationship Some
A neurodegenerative disease with characteristics of progressive muscular paralysis reflecting degeneration of motor neurons in the primary motor cortex, corticospinal tracts, brainstem and spinal cord. Associated with the ALS3 gene on the cytogenetic location 18q21. Is a True Hereditary disorder of nervous system Inferred relationship Some
A neurodegenerative disease with characteristics of progressive muscular paralysis reflecting degeneration of motor neurons in the primary motor cortex, corticospinal tracts, brainstem and spinal cord. Caused by heterozygous mutation in the VAPB gene on chromosome 20q13. Is a True Hereditary disorder of nervous system Inferred relationship Some
A neurodegenerative disease with characteristics of progressive muscular paralysis reflecting degeneration of motor neurons in the primary motor cortex, corticospinal tracts, brainstem and spinal cord. Caused by heterozygous mutation in the angiogenin gene (ANG) on chromosome 14q11. Is a True Hereditary disorder of nervous system Inferred relationship Some
A rare, genetic, neuro-ophthalmological disease characterized by congenital fourth cranial nerve palsy, manifesting with hypertropia in side gaze, unexplained head tilt, acquired vertical diplopia, and progressive increase in vertical fusional vergence amplitudes with prolonged occlusion. Facial asymmetry (i.e. hemifacial retrusion, upward slanting of mouth on the side of the head tilt, mild enophthalmos of paretic eye) and superior oblique tendon abnormalities (such as absence, redundance, misdirection) are frequently associated. Some asymptomatic cases have been reported. Is a True Hereditary disorder of nervous system Inferred relationship Some
A rare multiple congenital anomalies/dysmorphic syndrome characterized by profound intellectual disability, choreoathetosis, progressive spastic diplegia, progressive tapetoretinal degeneration with loss of retinal vessels, and glomerulopathy resulting in death late in the first or early in the second decade of life. Absence of the cerebellar granular layer has been reported. There have been no further descriptions in the literature since 1982. Is a True Hereditary disorder of nervous system Inferred relationship Some
A neurodegenerative disease with characteristics of progressive muscular paralysis reflecting degeneration of motor neurons in the primary motor cortex, corticospinal tracts, brainstem and spinal cord. There is evidence this disease is caused by heterozygous mutation in the TARDBP gene that encodes the TDP43 protein on chromosome 1p36. Is a True Hereditary disorder of nervous system Inferred relationship Some
A rare genetic neurological disorder characterized by congenital microcephaly, severe intellectual disability, hypertonia at birth lessening with age, ataxia, and specific dysmorphic facial features including hirsutism, low anterior hairline and bitemporal narrowing, arched, thick, and medially sparse eyebrows, long eyelashes, lateral upper eyelids swelling and a skin fold partially covering the inferior eyelids, low-set posteriorly rotated protruding ears, anteverted nares, and a full lower lip. Brain imaging shows partial to almost complete agenesis of the corpus callosum and variable degrees of cerebellar hypoplasia. Is a True Hereditary disorder of nervous system Inferred relationship Some
A rare, genetic, complex cerebral cortical malformation characterized by generalized or focal dysgyria (also named polymicrogyria-like cortical dysplasia) or alternatively by microlissencephaly with dysmorphic basal ganglia and dysgenesis of the corpus callosum. Clinical manifestations are variable and include microcephaly, seizures, hypotonia, developmental delay, severe psychomotor delay, ataxia, spastic diplegia or tetraplegia, and ocular abnormalities (strabismus, ptosis or optic atrophy). Is a True Hereditary disorder of nervous system Inferred relationship Some
A rare, genetic, neurological disorder characterized by childhood to adolescent onset of progressive myoclonus (which becomes very severe and results in major motor impediment) associated with infrequent tonic-clonic seizures, and, occasionally, ataxia. Learning disability prior to seizure onset and mild cognitive decline may be associated. Is a True Hereditary disorder of nervous system Inferred relationship Some
A rare genetic syndrome with a central nervous system malformation as a major feature, characterized by a triad of high alpha-fetoprotein levels in both maternal serum and amniotic fluid, cerebral ventriculomegaly, and renal macro- and microcysts. Variable findings include congenital nephrotic syndrome, aqueductal stenosis, gray matter heterotopias, and cardiac malformations, among others. Is a True Hereditary disorder of nervous system Inferred relationship Some
A rare genetic multiple congenital anomalies/dysmorphic syndrome characterized by global developmental delay, intellectual disability, growth retardation, hypotonia, cerebellar symptoms such as ataxia, spondyloepiphyseal dysplasia, and dysmorphic craniofacial features (including microcephaly, dolichocephaly, prominent ears, epicanthus, broad nasal bridge, long and flat philtrum, or small mouth). Additional reported manifestations are epilepsy, retinitis pigmentosa, and urogenital abnormalities, among others. Brain imaging may show cerebellar hypoplasia. Is a True Hereditary disorder of nervous system Inferred relationship Some
A rare genetic neurological disorder characterized by infantile hypotonia, congenital ophthalmic anomalies (including strabismus, esotropia, nystagmus, and central visual impairment), global developmental delay and intellectual disability, behavioral abnormalities, and movement disorder (such as dystonia, chorea, hyperkinesia, stereotypies). Mild facial dysmorphism and skeletal deformities have also been reported. EEG testing shows marked abnormalities in the absence of overt epileptic seizures. Is a True Hereditary disorder of nervous system Inferred relationship Some

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