Extradural Internal Carotid Artery Caliber Dysregulation Associated with Intradural Cerebral Aneurysms

During diagnostic cerebral angiography, it was subjectively noted by the senior author (AMM) that patients with IAs also presented with unexpected focal dilations of the extradural internal carotid artery (Supplemental Figure 1). Invariably, these dilations were noticed upstream to the location of the aneurysms and at considerable distance of what might be considered the vicinity of the lesions. In the region immediately after this focal expansion the arterial diameter returned to normal. This study attempts to quantify these differences in the caliber along the cervical and extradural ICA, as seen on cerebral angiography, between patients with aneurysms and control subjects.