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There was no additional intracranial abnormality during the course of hospitalisation. This case highlights the importance of considering subdural haemorrhage as a part of the amyloid-related imaging abnormality spectrum in AD patients with subdural hygromas undergoing amyloid-targeted therapies.<\/jats:p>","DOI":"10.1136\/bcr-2024-263497","type":"journal-article","created":{"date-parts":[[2025,1,8]],"date-time":"2025-01-08T09:01:02Z","timestamp":1736326862000},"page":"e263497","update-policy":"https:\/\/doi.org\/10.1136\/crossmarkpolicy","source":"Crossref","is-referenced-by-count":3,"title":["Spontaneous haemorrhage in subdural hygroma in an Alzheimer\u2019s patient on lecanemab"],"prefix":"10.1136","volume":"18","clinical-trial-number":[{"clinical-trial-number":"nct03887455","registry":"10.18810\/clinical-trials-gov"}],"author":[{"ORCID":"https:\/\/orcid.org\/0009-0000-6135-8872","authenticated-orcid":false,"given":"Memi","family":"Watanabe","sequence":"first","affiliation":[{"name":"Department of Diagnostic Radiology, Keio University School of Medicine, Shinjuku, 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