Basilar Artery Web Detected on CT Angiography: A Focal Intimal Pathology

Abstract A 40-year-old woman with severe headache and a family history of cerebral aneurysm underwent non-contrast head CT, which did not demonstrate any acute abnormalities. Intracranial CT angiography revealed a small focal filling defect in the proximal third of the basilar artery, consistent with a thin intraluminal membrane, characteristic of a basilar artery web. The patient was managed conservatively and remains under clinical follow-up.