To recognize a rare association of persistent carotid vertebrobasilar anastomoses with aneurysms To recognize the persistent carotid vertebrobasilar anastomoses and the vascular anatomy
Persistent carotid-vertebrobasilar anastomoses represent variant anatomical arterial communications between the anterior and posterior circulation,
providing major blood supply to the posterior circulation.
Persistent trigeminal artery (PTA) and persistent hypoglossal artery (PHA) are the two most common types of the persistent embryonic anastomoses.
Findings and procedure details
Etiology and demographics There are four persistent fetal anastomoses between the carotid and vertebrobasilar circulations.
These represent the non-obliterated remnants of the pre-segmental dorsal arteries which comprise the persistent primitive trigeminal artery (PPTA),
persistent hypoglossal artery (PHA),
persistent otic (acoustic) artery (POA) and the proatlantal intersegmental artery (PIA). These primitive carotid vertebrobasilar anastomoses occasionally persist into adulthood and may be...
The persistent primitive carotid vertebrobasilar anastomoses represent rare variant anatomical anastomoses between the anterior and posterior circulation.
these may provide majority of the vascular supply to the posterior circulation via the ICA.
these patients may present with concomitant aneurysms and thus may require operative or endovascular intervention.
Knowledge of the vascular anatomy and appropriate imaging work-up is thus necessary in patients with these...
Persistent primitive trigeminal arteries (PTA) and its variant (PTAV): analysis of 103 cases detected in 16,415 cases of MRA over 3 years.
PMID: 20309534. Dimmick S,
Normal Variants of the Cerebral Circulation at Multidetector CT Angiography.
PMID: 19605654. Luh G,
The persistent fetal carotid-vertebrobasilar anastomoses.
American Journal of Roentgenology...