Orphanet rare-disease nomenclature identifier Orphanet_324708 (Hereditary cerebral hemorrhage with amyloidosis, Iowa type) can be described as follows. Hereditary cerebral hemorrhage with amyloidosis (HCHWA), Iowa type is a form of HCHWA (see this term) characterized by age of onset between 50-66 years of age, memory impairment, myoclonic jerks, expressive dysphagia, short-stepped gait, personality changes and lobar intracerebral hemorrhages. Also known as: HCHWA, Iowa type.