| HPO |
HP:0001252 |
Hypotonia |
"Hypotonia is an abnormally low muscle tone (the amount of tension or resistance to movement in a muscle). Even when relaxed, muscles have a continuous and passive partial contraction which provides some resistance to passive stretching. Hypotonia thus manifests as diminished resistance to passive stretching. Hypotonia is not the same as muscle weakness, although the two conditions can co-exist." [HPO:probinson, PMID:21418198] |
Hypotonia can be caused by abnormalities of the central nervous system, any element of the motor unit (including the lower motoneuron), or both. Hypotonia is not a specific diagnosis, but can be observed in hundreds of genetic and other diseases. The first distinction to make when assessing a child with hypotonia is whether decreased muscle tone is a result of an abnormality of the central nervous system (CNS), peripheral neuromuscular system, or a combined abnormality involving both. Clinical findings suggestive of an abnormality of the CNS may include hyperreflexia, cognitive developmental delay, and seizures. In contrast, physical findings pointing towards a neuromuscular origin may include weakness, lack of antigravity movements, muscle atrophy, fasciculations, and/or diminished reflexes, most often in the context of normal cognitive function. The HPO term does not distinguish between these etiologies. Additional HPO terms should be used as required to describe associated features. |
HP:0003808 |
| HPO |
HP:0001041 |
Facial erythema |
"Redness of the skin of the face, caused by hyperemia of the capillaries in the lower layers of the skin." [HPO:probinson] |
— |
HP:0010783 |
| HPO |
HP:0002521 |
Hypsarrhythmia |
"Hypsarrhythmia is abnormal interictal high amplitude waves and a background of irregular spikes. There is continuous (during wakefulness), high-amplitude (>200 Hz), generalized polymorphic slowing with no organized background and multifocal spikes demonstrated by electroencephalography (EEG)." [HPO:curators] |
— |
HP:0011198 |
| HPO |
HP:0000980 |
Pallor |
"Abnormally pale skin." [HPO:probinson] |
— |
HP:0011121 |
| HPO |
HP:0002059 |
Cerebral atrophy |
"Atrophy (wasting, decrease in size of cells or tissue) affecting the cerebrum." [HPO:sdoelken] |
Atrophy may be progressive over time. |
HP:0007369 |
| 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:0002181 |
Cerebral edema |
"Abnormal accumulation of fluid in the brain." [HPO:probinson] |
Cerebral edema refers to swelling within brain tissue due to the accumulation of fluid, and can occur as in response to almost any insulting agent. Edema canbe observed in and around regions of dead or dying brain, around metastases and abscesses, after traumatic injury, following hypoxic ischemic injury, and around primary brain tumors. There are at least five different types of edema: vasogenic, cytotoxic, hydrostatic, interstitial, and hypoosmotic. Three effects of edema are visible on imaging: (i) loss of gray-white matter differentiation; (ii) swelling of sulci (shrinking of gyri); and (iii) mass effects. On CT scanning, extensive low density may represent vasogenic edema. As the brain swells, not only do the sulci decrease, but all of the CSF spaces of the hemispheres (including the ventricles) decrease as well. Magnetic resonance tomography may show abnormalities of diffusion-weighted imaging (DWI), and Fluid attenuation inversion recovery (FLAIR) sequences. Phenotype terms involving cerebral edema thus reflect inference about the underlying processes responsible for these abnormalities on brain imaging. |
HP:0000969, HP:0002060 |
| HPO |
HP:0007015 |
Poor gross motor coordination |
"An abnormality of the ability (skills) to perform a precise movement of large muscles with the intent to perform a specific act. Gross motor skills are required to mediate movements of the arms, legs, and other large body parts." [] |
— |
HP:0002275 |
| HPO |
HP:0001290 |
Generalized hypotonia |
"Generalized muscular hypotonia (abnormally low muscle tone)." [HPO:curators] |
— |
HP:0001252 |
| 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: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: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:0001285 |
Spastic tetraparesis |
"Spastic weakness affecting all four limbs." [HPO:curators] |
— |
HP:0001257, HP:0002273 |
| HPO |
HP:0200134 |
Epileptic encephalopathy |
"A condition in which epileptiform abnormalities are believed to contribute to the progressive disturbance in cerebral function. Epileptic encephalaopathy is characterized by (1) electrographic EEG paroxysmal activity that is often aggressive, (2) seizures that are usually multiform and intractable, (3) cognitive, behavioral and neurological deficits that may be relentless, and (4) sometimes early death." [PMID:21590624, PMID:23213494] |
Seizures alone without any underlying neurologic or medical illness can be the sole cause of encephalopathy. Patients with seizures as a cause or consequence of encephalopathy present with a wide variety of neurologic symptoms from mild reduction or alteration of consciousness to coma. Findings on neurologic exam are often nonfocal, nonspecific, and not predictive of the presence of seizures. Patients may or may not have subtle motor findings accompanying the presentation of encephalopathy. Signs range from very focal findings, such as nystagmus, eye flutter, blinking, and eye deviation to more widespread signs, such as myoclonus, tremulousness, and autonomic instability. |
HP:0001298 |
| HPO |
HP:0001332 |
Dystonia |
"An abnormally increased muscular tone that causes fixed abnormal postures. There is a slow, intermittent twisting motion that leads to exaggerated turning and posture of the extremities and trunk." [HPO:probinson] |
— |
HP:0100022 |
| HPO |
HP:0003593 |
Infantile onset |
"Onset of signs or symptoms of disease between 28 days to one year of life." [HPO:probinson] |
Onset of signs or symptoms of disease within the first 12 months of life. |
HP:0410280 |
| OMIM |
OMIM:613720 |
EPILEPTIC ENCEPHALOPATHY, EARLY INFANTILE, 7; EIEE7 |
— |
— |
— |
| OMIM |
OMIM:121200 |
SEIZURES, BENIGN FAMILIAL NEONATAL, 1; BFNS1 |
— |
— |
— |