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Start free with EleplanABri amyloidosis
ORPHA:97345Clinical subtype
Also called Familial dementia, British type
What it is
A rare, neurodegenerative disease characterized by progressive cognitive impairment, spastic tetraparesis, and cerebellar ataxia resulting from amyloid deposits in the brain. Spasticity with increased deep tendon reflexes and tone are early symptoms, muscular rigidity evolves later. Progressive mental deterioration usually starts with apathy and impaired memory with progression to complete disorientation.
Key facts
- Age of onset
- Adult
- Inheritance
- Autosomal dominant
- Classified as
- Clinical subtype
Recorded for the broader condition
- Prevalence
- <1 / 1 000 000ITM2B amyloidosis
Orphanet records these for the broader condition rather than for this specific form. They are a starting point, not a figure for this subtype — subtypes often differ, and some are defined by being rarer than the condition they sit under.
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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