{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,8,29]],"date-time":"2026-08-29T00:35:06Z","timestamp":1787963706385,"version":"build-2784847793"},"reference-count":19,"publisher":"Scientific Scholar","content-domain":{"domain":["surgicalneurologyint.com"],"crossmark-restriction":true},"short-container-title":[],"abstract":"\nBackground:<\/jats:title>\nVertebral artery dissection (VAD) is an important cause of stroke in young and middle- aged people. Bilateral occurrence of VAD is generally considered rare, but the number of reports of bilateral VAD has been increasing in recent years. In this paper, we report a case of de novo<\/jats:italic> VAD on the contralateral side presenting with subarachnoid hemorrhage in the acute stage of cerebral infarction due to unilateral VAD.<\/jats:p>\n<\/jats:sec>\n\nCase Description:<\/jats:title>\nA 52-year-old man developed sudden-onset left occipital headache, dizziness, dysphagia, and right-sided hemiparesthesia and was admitted to our hospital. Head magnetic resonance imaging on admission showed a left lateral medullary infarction due to the left VAD. At this point, the right vertebral artery was normal. However, on day 9 after onset, he suddenly presented with subarachnoid hemorrhage due to the right VAD. Emergency endovascular treatment was performed for the dissecting aneurysm of the right vertebral artery. The patient\u2019s condition improved gradually after the procedure, and he was discharged with a modified Rankin Scale score of 1.<\/jats:p>\n<\/jats:sec>\n\nConclusion:<\/jats:title>\nBilateral occurrence of VAD may be more common than previously believed. Even in cases of unilateral VAD, we need to pay attention to the occurrence of de novo<\/jats:italic> VAD on the contralateral side.<\/jats:p>\n<\/jats:sec>","DOI":"10.25259\/sni-78-2019","type":"journal-article","created":{"date-parts":[[2019,8,25]],"date-time":"2019-08-25T11:46:28Z","timestamp":1566733588000},"page":"126","update-policy":"https:\/\/doi.org\/10.25259\/crossmark_policy","source":"Crossref","is-referenced-by-count":6,"title":["A case of unilateral vertebral artery dissection progressing in a short time period to bilateral vertebral artery dissection"],"prefix":"10.25259","volume":"10","author":[{"given":"Kiyoshi","family":"Tsuji","sequence":"first","affiliation":[{"name":"Departments of Neurosurgery, Kindai University Faculty of Medicine, 377-2 Ohno-Higashi, Osaka-Sayama, Osaka, Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Akira","family":"Watanabe","sequence":"additional","affiliation":[{"name":"Departments of Neurosurgery, Nara Hospital, 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