{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,5,27]],"date-time":"2026-05-27T19:44:33Z","timestamp":1779911073543,"version":"3.53.1"},"reference-count":22,"publisher":"Journal of Neurosurgery Publishing Group (JNSPG)","issue":"20","license":[{"start":{"date-parts":[[2023,11,13]],"date-time":"2023-11-13T00:00:00Z","timestamp":1699833600000},"content-version":"unspecified","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"published-print":{"date-parts":[[2023,11,13]]},"abstract":"\n BACKGROUND<\/jats:title>\n Superficial temporal artery\u2013middle cerebral artery (STA-MCA) bypass surgery is performed to prevent ischemia and hemorrhage in patients with moyamoya disease. Only a few reports have described aneurysms appearing around the anastomosis site after bypass surgery, and the underlying mechanism remains unknown.<\/jats:p>\n <\/jats:sec>\n \n OBSERVATIONS<\/jats:title>\n The present case involved a 62-year-old woman who underwent STA-MCA bypass surgery for ischemic quasi-moyamoya disease at 46 years of age. Postoperatively, she underwent annual magnetic resonance imaging examinations. At 11 years after STA-MCA bypass surgery, a 3-mm aneurysm appeared at the anastomosis site. Four years later, headache developed and the aneurysm had grown to 5 mm. Craniotomy clipping was performed to prevent rupture. The patient was discharged home 2 weeks after surgery without any apparent complications.<\/jats:p>\n <\/jats:sec>\n \n LESSONS<\/jats:title>\n Long-term observation is crucial after direct bypass surgery for moyamoya disease. Measures to prevent rupture should be considered for cases involving aneurysm complications.<\/jats:p>\n <\/jats:sec>","DOI":"10.3171\/case23529","type":"journal-article","created":{"date-parts":[[2023,11,13]],"date-time":"2023-11-13T18:54:04Z","timestamp":1699901644000},"source":"Crossref","is-referenced-by-count":6,"title":["Aneurysm appearing at the anastomosis site 11 years after superficial temporal artery\u2013middle cerebral artery bypass surgery: moyamoya disease with a rapidly growing aneurysm. Illustrative case"],"prefix":"10.3171","volume":"6","author":[{"given":"Hiroki","family":"Eguchi","sequence":"first","affiliation":[{"name":"Department of Neurosurgery, Isesaki Sawa Medical Association Hospital, Gunnma, Japan; and"},{"name":"Department of Neurosurgery, Tokyo Women\u2019s Medical University Hospital, Tokyo, Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Koji","family":"Arai","sequence":"additional","affiliation":[{"name":"Department of Neurosurgery, Isesaki Sawa Medical Association Hospital, Gunnma, Japan; and"},{"name":"Department of Neurosurgery, Tokyo Women\u2019s Medical University Hospital, Tokyo, Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Takakazu","family":"Kawamata","sequence":"additional","affiliation":[{"name":"Department of Neurosurgery, Tokyo Women\u2019s Medical University Hospital, Tokyo, Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1754","reference":[{"issue":"2","key":"b1","series-title":"J Neurosurg","first-page":"408","article-title":"Effect of choroidal collateral vessels on de novo hemorrhage in moyamoya disease: analysis of nonhemorrhagic hemispheres in the Japan Adult Moyamoya Trial","volume":"132","author":"Funaki T","year":"2019","unstructured":"Funaki T, Takahashi JC, Houkin K, Effect of choroidal collateral vessels on de novo hemorrhage in moyamoya disease: analysis of nonhemorrhagic hemispheres in the Japan Adult Moyamoya Trial. J Neurosurg. 2019;132(2):408\u2013414."},{"issue":"5","key":"b2","series-title":"Stroke","first-page":"1415","article-title":"Effects of extracranial-intracranial bypass for patients with hemorrhagic moyamoya disease: results of the Japan Adult Moyamoya Trial","volume":"45","author":"Miyamoto S","year":"2014","unstructured":"Miyamoto S, Yoshimoto T, Hashimoto N, Effects of extracranial-intracranial bypass for patients with hemorrhagic moyamoya disease: results of the Japan Adult Moyamoya Trial. Stroke. 2014;45(5):1415\u20131421."},{"issue":"3","key":"b3","series-title":"Surg Neurol","first-page":"261","article-title":"A ruptured middle cerebral artery aneurysm originating from the site of anastomosis 20 years after extracranial-intracranial bypass for moyamoya disease: case report","volume":"64","author":"Nishimoto T","year":"2005","unstructured":"Nishimoto T, Yuki K, Sasaki T, Murakami T, Kodama Y, Kurisu K. A ruptured middle cerebral artery aneurysm originating from the site of anastomosis 20 years after extracranial-intracranial bypass for moyamoya disease: case report. Surg Neurol. 2005;64(3):261\u2013265."},{"issue":"6","key":"b4","series-title":"Acta Neurochir (Wien)","first-page":"1069","article-title":"Intracerebral hemorrhage caused by rupture of a giant aneurysm complicating superficial temporal artery-middle cerebral artery anastomosis for moyamoya disease","volume":"152","author":"Eom KS","year":"2010","unstructured":"Eom KS, Kim DW, Kang SD. Intracerebral hemorrhage caused by rupture of a giant aneurysm complicating superficial temporal artery-middle cerebral artery anastomosis for moyamoya disease. Acta Neurochir (Wien). 2010;152(6):1069\u20131073."},{"issue":"9","key":"b5","series-title":"Neurol Med Chir (Tokyo)","first-page":"824","article-title":"Moyamoya disease: recent progress and outlook","volume":"50","author":"Takahashi JC","year":"2010","unstructured":"Takahashi JC, Miyamoto S. Moyamoya disease: recent progress and outlook. Neurol Med Chir (Tokyo). 2010;50(9):824\u2013832."},{"key":"b6","series-title":"World Neurosurg","first-page":"583.e7","article-title":"De novo aneurysm associated with superficial temporal artery to middle cerebral artery bypass: report of two cases and review of literature","volume":"92","author":"Yokota H","year":"2016","unstructured":"Yokota H, Yokoyama K, Noguchi H. De novo aneurysm associated with superficial temporal artery to middle cerebral artery bypass: report of two cases and review of literature. World Neurosurg. 2016;92:583.e7\u2013583.e12."},{"issue":"3","key":"b7","series-title":"Neurosurg Rev","first-page":"517","article-title":"Navigation-guided clipping of a de novo aneurysm associated with superficial temporal artery-middle cerebral artery bypass combined with indirect pial synangiosis in a patient with moyamoya disease","volume":"40","author":"Aburakawa D","year":"2017","unstructured":"Aburakawa D, Fujimura M, Niizuma K, Sakata H, Endo H, Tominaga T. Navigation-guided clipping of a de novo aneurysm associated with superficial temporal artery-middle cerebral artery bypass combined with indirect pial synangiosis in a patient with moyamoya disease. Neurosurg Rev. 2017;40(3):517\u2013521."},{"issue":"4","key":"b8","series-title":"J Neurol Surg A Cent Eur Neurosurg","first-page":"323","article-title":"De novo aneurysm formation at the anastomosis site incidentally detected 2 years after single-barrel STA-MCA bypass surgery: case report and review of the literature","volume":"76","author":"Millesi M","year":"2015","unstructured":"Millesi M, Wang WT, Herta J, Bavinzski G, Knosp E, Gruber A. De novo aneurysm formation at the anastomosis site incidentally detected 2 years after single-barrel STA-MCA bypass surgery: case report and review of the literature. J Neurol Surg A Cent Eur Neurosurg. 2015;76(4):323\u2013327."},{"issue":"1","key":"b9","series-title":"Neurol Res","first-page":"46","article-title":"Bypass induced cerebral aneurysm","volume":"7","author":"Fein JM","year":"1985","unstructured":"Fein JM. Bypass induced cerebral aneurysm. Neurol Res. 1985;7(1):46\u201352."},{"issue":"4","key":"b10","series-title":"Surg Neurol","first-page":"305","article-title":"Pseudoaneurysm complicating superficial temporal artery--middle cerebral artery bypass","volume":"12","author":"Fleischer AS","year":"1979","unstructured":"Fleischer AS, Faria MA Jr, Hoffmann JC Jr. Pseudoaneurysm complicating superficial temporal artery--middle cerebral artery bypass. Surg Neurol. 1979;12(4):305\u2013306."},{"issue":"5","key":"b11","series-title":"Neurosurgery","first-page":"1051","article-title":"Subdural hemorrhage caused by de novo aneurysm complicating extracranial-intracranial bypass surgery: case report","volume":"38","author":"Kohno K","year":"1996","unstructured":"Kohno K, Ueda T, Kadota O, Sakaki S. Subdural hemorrhage caused by de novo aneurysm complicating extracranial-intracranial bypass surgery: case report. 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World Neurosurg. 2016;92:583.e7\u2013583.e12."},{"issue":"3","key":"b7","series-title":"Neurosurg Rev","first-page":"517","article-title":"Navigation-guided clipping of a de novo aneurysm associated with superficial temporal artery-middle cerebral artery bypass combined with indirect pial synangiosis in a patient with moyamoya disease","volume":"40","author":"Aburakawa D","year":"2017","unstructured":"Aburakawa D, Fujimura M, Niizuma K, Sakata H, Endo H, Tominaga T. Navigation-guided clipping of a de novo aneurysm associated with superficial temporal artery-middle cerebral artery bypass combined with indirect pial synangiosis in a patient with moyamoya disease. Neurosurg Rev. 2017;40(3):517\u2013521."},{"issue":"4","key":"b8","series-title":"J Neurol Surg A Cent Eur Neurosurg","first-page":"323","article-title":"De novo aneurysm formation at the anastomosis site incidentally detected 2 years after single-barrel STA-MCA bypass surgery: case report and review of the literature","volume":"76","author":"Millesi M","year":"2015","unstructured":"Millesi M, Wang WT, Herta J, Bavinzski G, Knosp E, Gruber A. De novo aneurysm formation at the anastomosis site incidentally detected 2 years after single-barrel STA-MCA bypass surgery: case report and review of the literature. J Neurol Surg A Cent Eur Neurosurg. 2015;76(4):323\u2013327."},{"issue":"1","key":"b9","series-title":"Neurol Res","first-page":"46","article-title":"Bypass induced cerebral aneurysm","volume":"7","author":"Fein JM","year":"1985","unstructured":"Fein JM. Bypass induced cerebral aneurysm. 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