{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,12,10]],"date-time":"2025-12-10T15:47:50Z","timestamp":1765381670189},"reference-count":33,"publisher":"Journal of Neurosurgery Publishing Group (JNSPG)","issue":"4","content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"published-print":{"date-parts":[[1996,4]]},"abstract":"<jats:p content-type=\"fine-print\">\u2713 Fenestration of the proximal anterior cerebral artery (A<jats:sub>1<\/jats:sub> segment) is a rare occurrence. This vascular anomaly is often associated with aneurysms and other abnormalities. The current article describes the case of a 33-year-old man who presented with a subarachnoid hemorrhage secondary to a ruptured aneurysm originating from the proximal end of an A<jats:sub>1<\/jats:sub> fenestration. This patient also had a contralateral A<jats:sub>1<\/jats:sub> fenestration as well as an azygos anterior cerebral artery. This is the first report of such an unusual vascular anatomy. 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