Hereditary cerebral hemorrhage with amyloidosis (HCHWA), Arctic type is a form of HCHWA characterized by an age of onset of 54-61 years and progressive Alzheimer's disease-like dementia, without intracerebral hemorrhages. The disease is ABeta amyloidosis, Arctic type (Monarch Disease Ontology entry MONDO_0017949). Also known as: ABetaE22G amyloidosis, HCHWA, Arctic type, cerebral amyloid angiopathy, APP-related, Arctic variant, hereditary cerebral haemorrhage with amyloidosis, Arctic type, hereditary cerebral hemorrhage with amyloidosis, Arctic type.