carotid siphon

carotid siphon

The S-shaped portion of the internal carotid artery just before it passes through the skull to join the circle of Willis.
References in periodicals archive ?
Caption: Right common carotid artery injection revealing severe vasospasm affecting the right carotid siphon before transluminal angioplasty is shown next to its corresponding transcranial doppler-measured cerebral blood flow velocity.
The patient was imaged using carotid angiography, and segmental narrowing of the carotid siphon was seen.
The mass surrounded and partially compressed the carotid siphon and petrous segment of the internal carotid artery.