Neuropathological Correlates of White Matter Hyperintensities in Cerebral Amyloid Angiopathy.

Background: White matter hyperintensities (WMHs) are frequently observed on magnetic resonance imaging (MRI) in patients with cerebral amyloid angiopathy (CAA). The neuropathological substrates that underlie WMHs in CAA are unclear, and it remains largely unexplored whether the different WMH distribution patterns associated with CAA (posterior confluent and subcortical multispot) reflect alternative pathophysiological mechanisms.

Methods And Results: We performed a combined in vivo MRI-ex vivo MRI-neuropathological study in patients with definite CAA.