Semin Thromb Hemost 2013; 39(08): 955-962
DOI: 10.1055/s-0033-1357489
Thieme Medical Publishers 333 Seventh Avenue, New York, NY 10001, USA.

Brain Hemorrhages in Cerebral Amyloid Angiopathy

Masahito Yamada
1   Department of Neurology and Neurobiology of Aging, Kanazawa University Graduate School of Medical Sciences, Kanazawa, Japan
› Author Affiliations
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Publication History

Publication Date:
09 October 2013 (online)

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Abstract

Cerebral amyloid angiopathy (CAA) is cerebrovascular amyloid deposition. It is classified into several types according to the cerebrovascular amyloid proteins involved. Sporadic amyloid β-protein (Aβ)-type CAA is commonly found in elderly individuals and patients with Alzheimer disease. CAA-related disorders include hemorrhagic and ischemic stroke and dementia. CAA-related hemorrhages include intracerebral lobar macrohemorrhages, cortical microhemorrhages, and focal subarachnoidal hemorrhages/superficial siderosis. CAA-associated vasculopathies, such as microaneurysmal formation with fibrinoid necrosis, underlie such cerebrovascular events. Sensitive magnetic resonance imaging procedures, such as gradient-echo T2* imaging and susceptibility-weighted images, are useful to detect microhemorrhagic lesions. Amyloid images with amyloid-binding positron emission tomography ligands can detect CAA, although they cannot discriminate vascular from parenchymal amyloid deposits. Hemorrhage-inducing factors for sporadic Aβ-type CAA include apolipoprotein E genotype, thrombolytic, anticoagulation, and antiplatelet therapies, hypertension, minor head trauma, and antiamyloid therapies. We need future strategies for protection of vessel walls against amyloid-related vascular damage, such as toxicity of Aβ oligomers, Aβ-induced oxidative stress, and inflammation, as well as development of antiamyloid therapies for CAA.