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Hereditary cerebral hemorrhage with amyloidosis (HCHWA), Piedmont type is a form of HCHWA (see this term) characterized by an age of onset between 50-70 years of age, recurrent lobar intracerebral hemorrhages and cognitive decline.
ORPHA:324703Classification level: Subtype of disorder
- ABeta amyloidosis, Piedmont type
- ABetaL34V-related amyloidosis
- HCHWA, Piedmont type
- Hereditary cerebral hemorrhage with amyloidosis, Piedmont type
- Prevalence: <1 / 1 000 000
- Inheritance: Autosomal dominant
- Age of onset: Adult, Elderly
- ICD-10: E85.4+ I68.0*
- OMIM: 605714
- UMLS: -
- MeSH: -
- GARD: -
- MedDRA: -
It has been found in only one Italian family.
HCHWA, Piedmont type is due to a mutation in the APP gene on chromosome 21q21.2, encoding the beta-amyloid precursor protein. This mutation causes an increased accumulation of amyloid-beta protein in the walls of the arteries and capillaries of the meninges, cerebellar cortex and cerebral cortex, leading to the weakening and eventual rupture of these vessels.
Transmission is autosomal dominant.
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