Cerebral Amyloid Angiopathy Related Inflammation: A Single-Center Case Series Analysis

BACKGROUND: Cerebral amyloid angiopathy-related inflammation (CAA-RI) is a rare subtype of cerebral amyloid angiopathy (CAA), which presents mostly as a subacute and reversible encephalopathy. Primary symptoms include behavioral changes and cognitive decline in the form of rapidly progressive dementia, headache, seizures, and focal neurological deficits. It can also manifest as a varied range of typical and atypical presentations. Misdiagnosis is common because it shares symptoms with other infectious, ischemic and autoimmune pathologies and there is also a significant overlap of MRI findings. METHODS: Gold standard diagnosis requires brain biopsy in appropriate clinical setting, but diagnostic criteria is established for probable and possible CAA-RI using clinical symptoms and MRI findings in the absence of other inflammatory, infectious or autoimmune processes. Immunomodulatory therapy is the mainstay of treatment, with variable response. RESULTS: We present a case series of three patients with CAA-RI highlighting disease course, neuroradiological manifestation, treatment response, and clinical outcomes. We also provide a literature review to increase insight into this rare pathology. CONCLUSIONS: Early diagnosis and prompt initiation of immunosuppressive therapy is beneficial in most cases.