| 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:0000365 | Hearing loss | |
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| HP:0000639 | Nystagmus | "Rhythmic, involuntary oscillations of one or both eyes related to abnormality in fixation, conjugate gaze, or vestibular mechanisms." [HPO:curators] |
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| HP:0000648 | Optic atrophy | |
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| HP:0000750 | Impaired language development | |
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| HP:0000763 | Sensory neuropathy | "Peripheral neuropathy affecting primarily the sensory nerves." [HPO:curators] |
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| HP:0001249 | Mental retardation | |
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| HP:0001250 | Seizures | "Seizures are an intermittent `abnormality of the central nervous system` (FMA:HP:0002011) due to a sudden, excessive, disorderly discharge of cerebral neurons and characterized clinically by some combination of disturbance of sensation, loss of consciousness, impairment of psychic function, or convulsive movements." [HPO:probinson] |
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| HP:0001251 | Ataxia | "Ataxia is a nonspecific neurological sign and symptom consisting of gross lack of coordination of muscle movements. Ataxia is caused by dysfunction of one or more parts of the nervous system including the cerebellum, the sensory nervous system, the vestibular system, or the cerebral cortex." [HPO:curators] |
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| HP:0001252 | Muscular hypotonia | "Muscular hypotonia is an abnormally low muscle tone (the amount of tension or resistance to movement in a muscle), often involving reduced muscle strength. Hypotonia is characterized by a diminished resistance to passive stretching." [HPO:curators] |
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| HP:0001258 | Spastic paraplegia | |
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| HP:0001260 | Dysarthria | "Dysarthric speech is a general description referring to a neurological speech disorder characterized by poor articulation. Depending on the involved neurological structures, dysarthria may be further classified as spastic, flaccid, ataxic, hyperkinetic and hypokinetic, or mixed." [HPO:curators] |
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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:0001265 | Hyporeflexia | |
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| HP:0001266 | Choreoathetosis | |
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| HP:0001290 | Generalized hypotonia | "Generalized muscular hypotonia (abnormally low muscle tone)." [HPO:curators] |
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| HP:0001310 | Dysmetria | |
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| HP:0001324 | Muscle weakness | "Reduced strength of muscles." [HPO:curators] |
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| 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:curators] |
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| HP:0001337 | Tremor | "An unintentional, oscillating to-and-fro muscle movement." [HPO:curators] |
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| HP:0001347 | Hyperreflexia | "The presence of overactive or overresponsive reflexes." [HPO:curators] |
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| HP:0001371 | Contractures | |
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| HP:0001376 | Decreased mobility of joints | |
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| HP:0001419 | X-linked recessive inheritance | "A mode of inheritance that is observed for recessive traits related to a gene encoded on the X chromosome. In the context of medical genetics, X-linked recessive disorders manifest in males (who have one copy of the X chromosome and are thus hemizygotes), but generally not in female heterozygotes who have one mutant and one normal allele." [HPO:curators] |
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| HP:0001508 | Failure to thrive | |
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| HP:0001583 | Rotary nystagmus | |
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| HP:0001761 | Pes cavus | |
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| HP:0002015 | Dysphagia | "Difficulty in swallowing." [HPO:curators] |
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| HP:0002061 | Lower limb spasticity | |
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| HP:0002064 | Spastic gait | |
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| HP:0002071 | Extrapyramidal signs | |
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| HP:0002168 | Scanning speech | |
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| HP:0002204 | Pulmonary embolism | |
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| HP:0002205 | Recurrent respiratory infections | |
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| HP:0002313 | Spastic paraparesis | |
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| HP:0002314 | Degeneration of the lateral corticospinal tracts | |
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| HP:0002361 | Psychomotor degeneration | |
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| HP:0002478 | Progressive spastic quadriplegia | |
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| HP:0002503 | Spinocerebellar tract degeneration | |
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| HP:0002599 | Head titubation | |
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| HP:0002607 | Bowel incontinence | |
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| HP:0003202 | Amyotrophy | "The presence of muscular atrophy (which is also known as amyotrophy)." [HPO:curators] |
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| HP:0003269 | Sudanophilic leukodystrophy | |
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| HP:0003487 | Babinski sign | "Upturning of the big toe (and sometimes fanning of the other toes) in response to stimulation of the sole of the foot. If the Babinski sign is present it can indicate damage to the corticospinal tract." [HPO:curators] |
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| HP:0003593 | Early onset | |
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| HP:0003621 | Juvenile onset | |
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| HP:0003677 | Slow progression | |
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| HP:0003812 | Phenotypic variability | |
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| HP:0004322 | Decreased body height | "A height below that which is expected according to age and gender norms. Although there is no universally accepted definition of short stature, many refer to "short stature" as height more than 2 standard deviations below the mean for age and gender (or below the 3rd percentile for age and gender dependent norms)." [HPO:curators] |
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| HP:0004886 | Congenital laryngeal stridor | |
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| HP:0005340 | Spastic/hyperactive bladder | |
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| HP:0007256 | Mild pyramidal signs | |
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| HP:0007266 | Dysmyelination of the brain | |
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| HP:0007340 | Lower limb muscle weakness | "Weakness of the muscles of the legs." [HPO:curators] |
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| HP:0100709 | Reduction of oligodendroglia | |
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