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Start free with EleplanAutosomal recessive spastic paraplegia type 11
ORPHA:2822Disease
Also called Nakamura-Osame syndrome · SPG11 · Spastic paraplegia-intellectual disability-thin corpus callosum syndrome
What it is
A complex hereditary spastic paraplegia characterized by progressive lower limbs weakness and spasticity, upper limbs weakness, dysarthria, hypomimia, sphincter disturbances, peripheral neuropathy, learning difficulties, cognitive impairment and dementia. Magnetic resonance imaging shows thin corpus callosum, cerebral atrophy, and periventricular white matter changes.
Key facts
- Prevalence
- 1-9 / 1 000 000 (Portugal)
- Age of onset
- Adolescent, Adult, Childhood, Infancy
- Inheritance
- Autosomal recessive
- Classified as
- Disease
Prevalence figures describe populations, not individuals, and are often estimates from a single study. Where the figure is an incidence or a birth prevalence, it says so.
Signs and symptoms
Very common80–99%
10Common30–79%
19- Abnormality of pattern visual evoked potentials
- Ataxia
- Atypical behavior
- Cerebral cortical atrophy
- Dysarthria
- Dysphagia
- EMG: axonal abnormality
- EMG: neuropathic changes
- Emotional lability
- Frontal cortical atrophy
- Gait disturbance
- Hyperintensity of cerebral white matter on MRI
- Hyperreflexia in upper limbs
- Inability to walk
- Lateral ventricle dilatation
- Memory impairment
- Nystagmus
- Saccadic smooth pursuit
- Short attention span
These ranges are how often a sign appears across everyone diagnosed, not a prediction for one person — most people have some of these and not others. Orphanet also records findings that are specifically absent in this disease; those are in the data but not listed here.
Gene
ICD-10 codes
ICD-10 has no distinct code for most rare diseases, so many are filed under the nearest available one. A shared code identifies the group, not this disease — the ORPHAcode above is what identifies it.
Related health topics
Reached through the ICD-10 categories this disease is filed under, so these describe the broader group rather than this disease specifically.
Cross-references
Orphadata Science: Free access data from Orphanet. © INSERM 1999. Data version 2026-06-23. Available under CC BY 4.0. This is a reference, not medical advice.
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