| 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 homozygotes. In the context of medical genetics, autosomal recessive disorders manifest in homozygotes (with two copies of the mutant allele) or compound heterozygotes (whereby each copy of a gene has a distinct mutant allele)." [HPO:curators] |
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| HP:0000252 | Microcephaly | "Microcephaly is a neurodevelopmental disorder in which the circumference of the head is more than two standard deviations smaller than the age- and gender-dependent norm." [HPO:curators] |
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| HP:0000253 | Microcephaly, progressive | "Progressive microcephaly is diagnosed when the head circumference falls progressively behind age- and gender-dependent norms." [HPO:curators] |
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| HP:0000286 | Epicanthus | "An epicanthal fold is a semilunar fold of skin that extends from the upper eyelid across the medial canthal area to the lower eyelid." [HPO:curators] |
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| HP:0000340 | Sloping forehead | "A form of the forehead that slopes from top to bottom in an anterior direction." [HPO:curators] |
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| HP:0000341 | Narrow forehead | "An abnormally reduced side-to-side width of the forehead." [HPO:curators] |
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| HP:0000358 | Posteriorly rotated ears | "A type of `abnormal location of the ears` (HP:0000357) in which the position of the ears is characterized by posterior rotation (the superior part of the ears is rotated towards the back of the head, and the inferior part of the ears towards the front)." [HPO:probinson] |
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| HP:0000369 | Low-set ears | "Low-set ears are defined to be set below an arbitrary line drawn between the lateral canthus of the eye and the occipital protruberance." [HPO:curators] |
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| HP:0000601 | Hypotelorism | |
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| HP:0001263 | Developmental retardation | "A delay in the achievement of motor or mental milestones manifested prior to age 18 and generally associated with lifelong mental and/or physical impairments." [HPO:curators] |
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| HP:0001290 | Generalized hypotonia | "Generalized muscular hypotonia (abnormally low muscle tone)." [HPO:curators] |
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| HP:0001347 | Hyperreflexia | "The presence of overactive or overresponsive reflexes." [HPO:curators] |
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| HP:0002059 | Cerebral atrophy | |
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| HP:0002079 | Hypoplasia of the corpus callosum | "Underdevelopment of the corpus callosum." [HPO:curators] |
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| HP:0002119 | Ventriculomegaly | |
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| HP:0002133 | Status epilepticus | |
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| HP:0003429 | Hypomyelination | |
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| HP:0003676 | Progressive disorder | |
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| HP:0006855 | Cerebellar vermis atrophy | |
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| HP:0009879 | Cortical gyral simplification | "An abnormal reduction of the number and complexity of the pattern of gyrations of the cerebral cortex." [HPO:curators] |
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