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A middle-aged female underwent surgery for unruptured middle cerebral artery bifurcation aneurysms. The patient tolerated the neurosurgical procedure well. Seven days postoperatively, the headache was unbearable; a postcraniotomy headache persisted and abruptly presented with global aphasia and right-sided hemiplegia after a nap. Emergency digital subtraction angiography showed severe luminal narrowing with segmental vasoconstriction, consistent with severe vasospasm. The patient\u2019s neurological deficit improved after chemical angioplasty. Neurosurgeons should pay close attention to this treatable\/preventive entity after neurological deterioration following UIA clipping, even in patients without subarachnoid hemorrhage.<\/jats:p>","DOI":"10.5469\/neuroint.2024.00150","type":"journal-article","created":{"date-parts":[[2024,6,13]],"date-time":"2024-06-13T23:05:57Z","timestamp":1718319957000},"page":"123-128","update-policy":"https:\/\/doi.org\/10.5469\/crossmark_policy","source":"Crossref","is-referenced-by-count":3,"title":["A Case of Severe Delayed Vasospasm after Clipping Surgery for an Unruptured Intracranial 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