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At 44 months after surgery, a de novo aneurysm developed at the site of anastomosis. The aneurysm developed in the front wall of the anastomosis site, and projected to the anterosuperior direction. A computational fluid dynamics (CFD) study showed the localized region with high wall shear stress coincident with the pulsation in the front wall of the anastomosis site, where the aneurysm developed. A Y-shaped superficial temporal artery (STA) interposition graft was used successfully to reconstruct both ACAs, and then the aneurysm was trapped. To the authors\u2019 knowledge, this is the first case of a de novo aneurysm that developed at the site of an ACA-ACA side-to-side anastomosis. A CFD study showed that hemodynamic stress might be an underlying cause of the aneurysm formation. A Y-shaped STA interposition graft is a useful option to treat this aneurysm. Long-term follow-up is necessary to detect this rare complication after ACA-ACA anastomosis.<\/jats:p>","DOI":"10.3171\/2017.6.jns17931","type":"journal-article","created":{"date-parts":[[2017,12,22]],"date-time":"2017-12-22T15:01:37Z","timestamp":1513954897000},"page":"1120-1124","source":"Crossref","is-referenced-by-count":7,"title":["Revascularization of the anterior cerebral artery by Y-shaped superficial temporal artery interposition graft for the treatment of a de novo aneurysm arising at the site of A3-A3 bypass: technical case report"],"prefix":"10.3171","volume":"129","author":[{"given":"Hidenori","family":"Endo","sequence":"first","affiliation":[{"name":"Departments of Neurosurgery and"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Shin-ichiro","family":"Sugiyama","sequence":"additional","affiliation":[{"name":"Neuroanesthesia, Kohnan Hospital, Sendai;"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Toshiki","family":"Endo","sequence":"additional","affiliation":[{"name":"Departments of Neurosurgery and"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Miki","family":"Fujimura","sequence":"additional","affiliation":[{"name":"Department of Neurosurgery, Tohoku University Graduate School of Medicine, Sendai; and"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Hiroaki","family":"Shimizu","sequence":"additional","affiliation":[{"name":"Department of Neurosurgery, Akita University Graduate School of Medicine, Akita, Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Teiji","family":"Tominaga","sequence":"additional","affiliation":[{"name":"Department of Neurosurgery, Tohoku University Graduate School of Medicine, Sendai; and"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1754","reference":[{"key":"b1","series-title":"J Neurosurg","doi-asserted-by":"publisher","first-page":"1364","DOI":"10.3171\/2014.3.JNS132219","article-title":"Anterior cerebral artery bypass for complex aneurysms: an experience with intracranial-intracranial reconstruction and review of bypass options","volume":"120","author":"Abla AA","year":"2014","unstructured":"Abla AA, Lawton MT: Anterior cerebral artery bypass for complex aneurysms: an experience with intracranial-intracranial reconstruction and review of bypass options. 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