Lobar hemorrhage is a subtype of intracranial hemorrhage, which generally carries a poor prognosis. Primary lobar hemorrhages, usually due to cerebral amyloid angiopathy, are typically seen in elderly patients. Cerebral amyloid angiopathy (CAA), is a form of angiopathy in which amyloid beta peptide deposits in the walls of small to medium blood vessels of the central nervous system and meninges.Cerebral amyloid angiopathy increases the risk for stroke caused by bleeding and dementia.