ITM2B and ABri amyloidosis: Two examples of non‐Aβ CAA are Familial British dementia (FBD) and Familial Danish dementia (FDD), where a mutated form of integral membrane protein 2B (BRI2) causes vascular and leptomeningeal accumulation of the ABri or ADan amyloid, respectively (Garringer, Murrell, D'Adamio, Ghetti, & Vidal, 2010).