A Postmarketing Study of LEQEMBI in South Korean Participants With Alzheimer's Disease

The primary purpose of this study is to evaluate safety of LEQEMBI in the real-world clinical setting as reported by events of amyloid-related imaging abnormalities (ARIA)-edema (ARIA-E), ARIA-hemosiderin deposition (ARIA-H), symptomatic ARIA-E, symptomatic ARIA-H, and intracerebral hemorrhage (ICH) greater-than 1 centimeter (cm) in patients treated with LEQEMBI.

Inclusion Criteria: * Enrolled in JOY-ALZ before the decision to treat with LEQEMBI * The clinical decision to treat with LEQEMBI has already been made * Provides written informed consent for the use of medical information to be shared with Eisai Korea Inc. Exclusion Criteria: * Currently participating in an interventional clinical study