J Korean Radiol Soc.  1989 Jun;25(3):353-361. 10.3348/jkrs.1989.25.3.353.

Variations and anomalies of the circle of Willis in Korean: Cerebral digital subtraction angiogram studies in 200 cases

• Lee O
• Chung GS
• Kim SS
• Huh JD
• Kim HJ
• Joh YD

• KMID: 2359096
• DOI: http://doi.org/10.3348/jkrs.1989.25.3.353

Abstract

In order to evaluate the vriations of the circle of Willis in korean population, digital subtraction angiograms in 200 cases were retrospectively analyzed. There was non-visualization of the anterior communicating artery and the posterior communicating artery in 41 cases and this was the most common type or 4 vessel cerebralangiogram(20.5%). Unilateral or bilateral non-visualization of the posterior communicating artery was noted in 40cases (20%). The fetal origin of the posterior cerebral artery from the internal carotid artery was seen in 22cases (11%). In 20 out of 22 cases, there were non-visualization of either the anterior communicating or posterior communicating artery. Visualization of the anterior communicating artery was noted in 102 cases (51%) and of the posterior communicating artery in 87 cases (43.5%). Hypoplasia of the anterior cerebral artery was noted in 24cases (12%). Non-visualization of the anterior communicating artery or unilateral posterior communicating arteryis noted in 16 cases (8%). Non-visualization of the anterior communicating artery was seen in 14 cases (7%). The most common type in appearance of the basilar artery variation was straight type (Type 1:51%) and bifurcation ofthe basilar artery was most commonly located above the posterior clinoid process of the dorsum sellae (58%) on vertebral angiogram.

MeSH Terms

Anterior Cerebral Artery
Arteries
Basilar Artery
Carotid Artery, Internal
Circle of Willis*
Posterior Cerebral Artery
Retrospective Studies