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

## TL;DR

This paper presents three cases of a rare brain condition called CAA-RI and emphasizes the importance of early diagnosis and treatment for better outcomes.

## Contribution

The study contributes a detailed case series and literature review on the rare condition CAA-RI, emphasizing diagnostic and treatment insights.

## Key findings

- CAA-RI can present with a wide range of symptoms, leading to frequent misdiagnosis.
- Immunosuppressive therapy shows variable but beneficial outcomes when initiated early.
- MRI findings often overlap with other conditions, complicating diagnosis without biopsy.

## Abstract

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.