| HPO |
HP:0009879 |
Simplified gyral pattern |
"An abnormality of the cerebral cortex with fewer gyri but with normal cortical thickness. This pattern is usually often associated with congenital microcephaly." [COST:neuromig, HPO:probinson, PMID:22427329] |
— |
HP:0002536 |
| 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:0012444 |
Brain atrophy |
"Partial or complete wasting (loss) of brain tissue that was once present." [HPO:probinson] |
— |
HP:0007367, HP:0012443 |
| HPO |
HP:0002472 |
Small cerebral cortex |
"Reduced size of the cerebral cortex." [HPO:probinson] |
— |
HP:0002538 |
| HPO |
HP:0001317 |
Abnormal cerebellum morphology |
"Any structural abnormality of the cerebellum." [HPO:probinson, PMID:27160001] |
A malformed cerebellum may be abnormally small, dysplastic, or unusually large. The vermis and both hemispheres may be equally or disproportionately affected. Primary malformations of the pons, midbrain, and supratentorial structures are also seen in a substantial subset of patients. The wide range in morphological presentations results from the diversity of causes, including chromosomal abnormalities, specific genetic syndromes, and extrinsic factors. |
HP:0011283 |
| HPO |
HP:0002119 |
Ventriculomegaly |
"An increase in size of the ventricular system of the brain." [HPO:probinson] |
— |
HP:0002118 |
| HPO |
HP:0012757 |
Abnormal neuron morphology |
"A structural anomaly of a neuron." [KI:phemming] |
— |
HP:0012639 |
| HPO |
HP:0002171 |
Gliosis |
"Gliosis is the focal proliferation of glial cells in the central nervous system." [HPO:sdoelken] |
Gliosis generally occurs as a response to tissue damage. Gliosis appears bright on T2 scans upon magnetic resonance imaging, unlike encephalomalacia which follows CSF signal on all sequences. Glial cells, the non-neuronal component of the central nervous system, are divided into microglia and macroglia. The latter are in turn divided into astrocytes, oligodendrocytes, and ependymal cells. The astrocytes and the microglia are the glial cells predominantly responsible for tissue response to injury. |
HP:0100705 |
| HPO |
HP:0012448 |
Delayed myelination |
"Delayed myelination." [ORCID:0000-0001-5208-3432] |
— |
HP:0012447 |
| HPO |
HP:0003429 |
CNS hypomyelination |
"Reduced amount of myelin in the central nervous system resulting from defective myelinogenesis." [HPO:probinson] |
— |
HP:0011400 |
| HPO |
HP:0000426 |
Prominent nasal bridge |
"Anterior positioning of the nasal root in comparison to the usual positioning for age." [PMID:19152422] |
A prominent nasal bridge can occur irrespective of the width of the nasal bridge, and the width should be assessed separately. The nasal bridge becomes more prominent with age. Although the nasal root may be anteriorly placed without increasing the space between the eyes, prominence of the nasal bridge may be accompanied by Telecanthus or ocular Hypertelorism. If such findings are present these should be coded separately. Deep-set eyes may lead to the impression of a prominent nasal bridge, but this finding should be coded separately. |
HP:0000422 |
| HPO |
HP:0011344 |
Severe global developmental delay |
"A severe delay in the achievement of motor or mental milestones in the domains of development of a child." [DDD:hvfirth] |
— |
HP:0001263 |
| 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:0000340 |
Sloping forehead |
"Inclination of the anterior surface of the forehead from the vertical more than two standard deviations above the mean (objective); or apparently excessive posterior sloping of the forehead in a lateral view." [PMID:19125436] |
Measurement requires an angle meter, inclined on the anterior surface of the forehead, in the midline, along a line connecting the hairline to the glabella, compared to the vertical. |
HP:0000290 |
| HPO |
HP:0001518 |
Small for gestational age |
"Smaller than normal size according to sex and gestational age related norms, defined as a weight below the 10th percentile for the gestational age." [DDD:hfirth] |
— |
HP:0004325 |
| HPO |
HP:0001511 |
Intrauterine growth retardation |
"An abnormal restriction of fetal growth with fetal weight below the tenth percentile for gestational age." [HPO:probinson] |
Intrauterine growth restriction is a newer term that is preferred over Intrauterine growth retardation. The causes of IUGR include maternal abnormalities (chronic hypertension, cyanotic heart disease, smoking, drug abuse), placental or umbilical cord abnormalities (including placenta previa and cord anomalies), maternal medicationas, and genetic disorders of the fetus. |
HP:0001510 |
| HPO |
HP:0003577 |
Congenital onset |
"A phenotypic abnormality that is present at birth." [HPO:probinson] |
Congenital onset literally means present at birth. Congenital abnormalities are thus generally acquired during fetal development. Congenital abnormalities are often but not always hereditary in nature. Whether a disease manifestation is diagnosed to be intrauterine or congenital may depend on the time at which diagnostic procedures are performed. Thus, most congenital abnormalities are also intrauterine. This term should be used for phenotypic abnormalities or diseases initially observed at the time of birth. For abnormalities observed prior to (e.g., by fetal ultrasound), use the term Antenatal onset (HP:0030674). |
HP:0003674 |
| HPO |
HP:0001257 |
Spasticity |
"A motor disorder characterized by a velocity-dependent increase in tonic stretch reflexes with increased muscle tone, exaggerated (hyperexcitable) tendon reflexes." [HPO:probinson] |
— |
HP:0001276, HP:0002493 |
| 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:0001272 |
Cerebellar atrophy |
"Cerebellar atrophy is defined as a cerebellum with initially normal structures, in a posterior fossa with normal size, which displays enlarged fissures (interfolial spaces) in comparison to the foliae secondary to loss of tissue. Cerebellar atrophy implies irreversible loss of tissue and result from an ongoing progressive disease until a final stage is reached or a single injury, e.g. an intoxication or infectious event." [HPO:probinson, PMID:12169461, PMID:26331051] |
Cerebellar atrophy can be diagnosed if the cerebellum is small with shrunken folia and large cerebellar fissures or if it has been shown to undergo progressive volume loss. |
HP:0001317 |
| HPO |
HP:0000453 |
Choanal atresia |
"Absence or abnormal closure of the choana (the posterior nasal aperture)." [HPO:probinson] |
— |
HP:0000415 |
| HPO |
HP:0000007 |
Autosomal recessive 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 individuals with two pathogenic alleles, either homozygotes (two copies of the same mutant allele) or compound heterozygotes (whereby each copy of a gene has a distinct mutant allele)." [HPO:probinson] |
— |
HP:0000005 |
| HPO |
HP:0012736 |
Profound global developmental delay |
"A profound delay in the achievement of motor or mental milestones in the domains of development of a child." [DDD:hvfirth] |
— |
HP:0001263 |
| HPO |
HP:0000347 |
Micrognathia |
"Developmental hypoplasia of the mandible." [HPO:probinson] |
Mandibular hypoplasia, also known as micrognathia, is a term that describes an abnormally small lower jaw. |
HP:0009118 |
| HPO |
HP:0002804 |
Arthrogryposis multiplex congenita |
"Multiple congenital contractures in different body areas." [HPO:probinson, PMID:23050160] |
Arthrogryposis multiplex congenita (AMC) consists of several conditions of different etiology and mixed clinical features, including multiple congenital contractures in multiple body areas. Here, we use the term to refer solely to the multiple congenital contractures. It is related to fetal akinesia owing to fetal neurogenic, muscle, or connective tissue disorders or occasionally to maternal conditions. AMC can be associated with polyhydramnios, pulmonary hypoplasia, micrognathia, ocular hypertelorism, and short umbilical cord. AMC is a feature of a heterogeneous group of disorders, some of which have the phrase 'arthrogryposis multiplex congenita' as a part of their name (for instance, Arthrogryposis multiplex congenita, distal type 1 or AMCD1). This term refers to the finding of multiple joint contractures found throughout the body at birth rather than to the disease entities of which this is a clinical feature. |
HP:0002803 |