{"id":"1b830ce8-9762-46fd-8b23-e099584a4b6c","slug":"cognard-type-iiab-dural-arteriovenous-fistula-presenting-as-a-chronic-subdural-hematoma-a-case-report","title":"Cognard type IIa+b dural arteriovenous fistula presenting as a chronic subdural hematoma: A case report","authors":["Yoshiki Mochizuki","Takuma Maeda","Akio Teranishi","Eisuke Tsukagoshi","Taro Yanagawa","Masataka Yoshimura","Hiroki Kurita","Shinya Kohyama"],"abstract":"Background: Dural arteriovenous fistula (DAVF) has been reported as a rare cause of chronic subdural hematoma (CSDH); however, CSDH associated with a Cognard type IIa+b DAVF has not been reported. Case Description: A 56-year-old woman without traumatic history presented with headache and was diagnosed with right-sided CSDH and a transverse-sigmoid sinus DAVF. She underwent transvenous and transarterial embolization along with burr-hole drainage. Although residual shunting persisted after the first session, complete resolution was achieved after the third. Over 4 years of follow-up, there was no recurrence of CSDH or DAVF. Conclusion: This case highlights that DAVFs can cause CSDH regardless of the Cognard type, and that combined curative DAVF treatment and drainage may be effective.","thumbnailUrl":"https://sni-digital-videos.s3.amazonaws.com/articles/1b830ce8-9762-46fd-8b23-e099584a4b6c/featured/hero-1781558138659.png","publishDate":"2025-12-05T00:00:00.000Z","doi":"10.25259/SNI_961_2025","categories":["Neurovascular","Case Report"],"fullTextUrl":"https://surgicalneurologyint.com/wp-content/uploads/2025/12/14125/SNI-16-516.pdf"}