| HPO |
HP:0002352 |
Leukoencephalopathy |
"This term describes abnormality of the white matter of the cerebrum resulting from damage to the myelin sheaths of nerve cells." [HPO:probinson] |
This feature can be demonstrated by magnetic resonance imaging or computer tomography. |
HP:0002060 |
| HPO |
HP:0010818 |
Generalized tonic seizure |
"A generalized tonic seizure is a type of generalized motor seizure characterised by bilateral limb stiffening or elevation, often with neck stiffening without a subsequent clonic phase. The tonic activity can be a sustained abnormal posture, either in extension or flexion, sometimes accompanied by tremor of the extremities." [HPO:jalbers, HPO:probinson, PMID:11580774, PMID:28276060, PMID:28276064] |
Characterized by a sudden increase in muscle tone whereby the body, arms, or legs make sudden stiffening movements and consciousness is usually preserved. Tonic seizures can occur during sleep. Tonic seizures usually affect both sides of the body, and cause a fall if the affected person was standing when the seizure started. |
HP:0032677, HP:0032792 |
| HPO |
HP:0100716 |
Self-injurious behavior |
"Aggression towards oneself." [HPO:sdoelken] |
— |
HP:0006919 |
| HPO |
HP:0200136 |
Oral-pharyngeal dysphagia |
— |
— |
HP:0002015 |
| HPO |
HP:0002384 |
Focal impaired awareness seizure |
"Focal impaired awareness seizure (or focal seizure with impaired or lost awareness) is a type of focal-onset seizure characterized by some degree (which may be partial) of impairment of the person's awareness of themselves or their surroundings at any point during the seizure." [HPO:pnrobinson, PMID:28276062, PMID:28276064, PMID:9738682] |
Awareness during a seizure is defined as the person being fully aware of themselves and their environment throughout the seizure, even if immobile. If awareness is impaired at any point during the seizure, the seizure is a focal impaired awareness seizure. The degree of loss of awareness may vary. The terms 'complex partial seizure' and 'focal dyscognitive seizure' were previously used to denote a focal impaired awareness seizure. |
HP:0007359, HP:0011146 |
| HPO |
HP:0011147 |
Typical absence seizure |
"A typical absence seizure is a type of generalised non-motor (absence) seizure characterised by its sudden onset, interruption of ongoing activities, a blank stare, possibly a brief upward deviation of the eyes. Usually the patient will be unresponsive when spoken to. Duration is a few seconds to half a minute with very rapid recovery. Although not always available, an EEG would usually show 3 Hz generalized epileptiform discharges during the event." [HPO:jalbers, PMID:28276060, PMID:28276062, PMID:28276064, PMID:6790275] |
In 2017 the ILAE Commission for Classification and Terminology recommended classifying a seizure as having focal or generalized onset only when there is a high degree of confidence (>80%, arbitrarily chosen to parallel the usual allowable beta error) in the accuracy of this determination; see Dialeptic seizure. Typical absences have 2 essential components: (1) clinically the impairment of consciousness (absence), and (2) EEG generalized 3 Hz to 4 Hz (less than 2.5 Hz) spike and slow wave discharges. |
HP:0002121 |
| HPO |
HP:0002342 |
Intellectual disability, moderate |
"Moderate mental retardation is defined as an intelligence quotient (IQ) in the range of 35-49." [HPO:curators] |
— |
HP:0001249 |
| HPO |
HP:0001256 |
Intellectual disability, mild |
"Mild intellectual disability is defined as an intelligence quotient (IQ) in the range of 50-69." [HPO:probinson] |
— |
HP:0001249 |
| HPO |
HP:0006829 |
Severe muscular hypotonia |
"A severe degree of muscular hypotonia characterized by markedly reduced muscle tone." [HPO:curators] |
— |
HP:0001252 |
| HPO |
HP:0000729 |
Autistic behavior |
"Persistent deficits in social interaction and communication and interaction as well as a markedly restricted repertoire of activity and interest as well as repetitive patterns of behavior." [HPO:probinson, PMID:28879490] |
This term can be used to refer to autism spectrum disorder as a phenotypic feature that can be a component of a disease. Autism spectrum disorder range from a severe form, called autistic disorder, to a milder form, Asperger syndrome. |
HP:0000708 |
| HPO |
HP:0002360 |
Sleep disturbance |
"An abnormality of sleep including such phenomena as 1) insomnia/hypersomnia, 2) non-restorative sleep, 3) sleep schedule disorder, 4) excessive daytime somnolence, 5) sleep apnea, and 6) restlessness." [HPO:curators] |
— |
HP:0000708 |
| HPO |
HP:0002079 |
Hypoplasia of the corpus callosum |
"Underdevelopment of the corpus callosum." [HPO:probinson, PMID:21263138] |
The corpus callosum appears thin in midline views of the brain in neuroradiological images. |
HP:0007370 |
| HPO |
HP:0000252 |
Microcephaly |
"Head circumference below 2 standard deviations below the mean for age and gender." [PMID:15806441, PMID:19125436, PMID:25465325, PMID:9683597] |
Head circumference is measured from just above the glabella (the most prominent point on the frontal bone above the root of the nose) to the most posterior prominent point of the occipital bone using a tape measure. Some standard charts are organized by centiles, others by standard deviations. It is important to add an indication of how far below the normal standard the head circumference is if an accurate assessment of this can be made. Microcephaly is an absolute term. The term relative microcephaly can be used when the head size centile is less than the centile for height, for example, head size at the 3rd centile with height at the 75% for age and sex. On prenatal ultrasound, microcephaly is diagnosed if the head circumference or the biparietal diameter is more than three standard deviations below the mean. Microcephaly is divided into primary microcephaly, which is present at birth, and secondary microcephaly, which develops postnatally. The crucial difference between these groupings is that primary microcephaly is usually a static developmental anomaly, whereas secondary microcephaly indicates a progressive neurodegenerative condition |
HP:0007364, HP:0040195 |
| HPO |
HP:0100660 |
Dyskinesia |
"A movement disorder which consists of effects including diminished voluntary movements and the presence of involuntary movements." [HPO:sdoelken] |
— |
HP:0100022 |
| HPO |
HP:0032410 |
Bilateral generalized polymicrogyria |
"Symmetric generalized polymicrogyria with no obvious gradient or region of maximal severity; may have abnormal high signal in white matter." [COST:neuromig, PMID:20301504] |
— |
HP:0025646 |
| HPO |
HP:0001249 |
Intellectual disability |
"Subnormal intellectual functioning which originates during the developmental period. Intellectual disability, previously referred to as mental retardation, has been defined as an IQ score below 70." [HPO:probinson] |
This term should be used for children at least five years old. For younger children, consider the term Global developmental delay (HP:0001263). |
HP:0011446, HP:0012759 |
| HPO |
HP:0000006 |
Autosomal dominant inheritance |
"A mode of inheritance that is observed for traits related to a gene encoded on one of the autosomes (i.e., the human chromosomes 1-22) in which a trait manifests in heterozygotes. In the context of medical genetics, an autosomal dominant disorder is caused when a single copy of the mutant allele is present. Males and females are affected equally, and can both transmit the disorder with a risk of 50% for each child of inheriting the mutant allele." [HPO:curators] |
— |
HP:0000005 |
| HPO |
HP:0003828 |
Variable expressivity |
"A variable severity of phenotypic features." [HPO:probinson] |
This term can be applied to disease entities but not to individuals. It may be made obsolete in future versions of the HPO. |
HP:0003812 |
| HPO |
HP:0002465 |
Poor speech |
— |
— |
HP:0002167 |
| HPO |
HP:0001250 |
Seizure |
"A seizure is an intermittent abnormality of nervous system physiology characterised by a transient occurrence of signs and/or symptoms due to abnormal excessive or synchronous neuronal activity in the brain." [HPO:probinson, PMID:15816939] |
A type of electrographic seizure has been proposed in neonates which does not have a clinical correlate, it is electrographic only. The term epilepsy is not used to describe recurrent febrile seizures. Epilepsy presumably reflects an abnormally reduced seizure threshold. |
HP:0012638 |
| HPO |
HP:0001263 |
Global developmental delay |
"A delay in the achievement of motor or mental milestones in the domains of development of a child, including motor skills, speech and language, cognitive skills, and social and emotional skills. This term should only be used to describe children younger than five years of age." [DDD:hvfirth, HPO:sdoelken] |
Developmental retardation is any significant lag in development in the any or all of the physical, cognitive, behavioral, emotional, or social spheres. Note that the term intellectual disability (mental retardation) refers to not merely a delay in development but rather a permanent limitation. Note that the term 'psychomotor retardation' is also used in some contexts to refer to a slowing of thought and physical movements as a result of major depression or intoxication. |
HP:0012758 |
| HPO |
HP:0002376 |
Developmental regression |
"Loss of developmental skills, as manifested by loss of developmental milestones." [DDD:hvfirth] |
Developmental regression is said to occur when a child that has reached a certain psychomotor developmental stage starts to regress and to lose the acquired milestones. |
HP:0012759 |
| HPO |
HP:0001290 |
Generalized hypotonia |
"Generalized muscular hypotonia (abnormally low muscle tone)." [HPO:curators] |
— |
HP:0001252 |
| HPO |
HP:0007018 |
Attention deficit hyperactivity disorder |
"Attention deficit hyperactivity disorder (ADHD) manifests at age 2-3 years or by first grade at the latest. The main symptoms are distractibility, impulsivity, hyperactivity, and often trouble organizing tasks and projects, difficulty going to sleep, and social problems from being aggressive, loud, or impatient." [HPO:curators] |
— |
HP:0000736, HP:0000752 |