ABetaA21G amyloidosis (Monarch Disease Ontology id MONDO_0017948) can be described as follows. Hereditary cerebral hemorrhage with amyloidosis (HCHWA), Flemish type is a form of HCHWA characterized by an age of onset of 45 years of age, progressive Alzheimer's disease-like dementia and lobar intracerebral hemorrhage in some patients. Also known as: ABeta amyloidosis, Flemish type, ABetaA21G-related amyloidosis, HCHWA, Flemish type, cerebral amyloid angiopathy, APP-related, Flemish variant, hereditary cerebral haemorrhage with amyloidosis, Flemish type, hereditary cerebral hemorrhage with amyloidosis, Flemish type.