Table 2.

Modified Boston criteria.

	Clinical data and MRI/CT demonstrating:
Probable CAA	-Multiple hemorrhages (ICH, CMB) restricted to lobar, cortical, or cortico-subcortical regions (CBL allowed) OR single lobar, cortical, or cortico-subcortical hemorrhage and cSS (focal or disseminated) -Age ≥ 55 years -Absence of other cause of hemorrhage
Possible CAA	-Single lobar, cortical, or cortico-subcortical ICH, CMB, or cSS (focal or disseminated) -Age ≥ 55 years -Absence of other cause of hemorrhage

To classify patients according to the modified Boston criteria non-contrast CT and/or MRI are evaluated. In this table, only the categories without incorporation of histopathological data are shown. CAA = cerebral amyloid angiopathy; CBL = cerebellum; CMB = cerebral microbleed; cSS = cortical superficial siderosis; ICH = intracerebral hemorrhage.