The azygos anterior cerebral artery (azygos ACA) is a rare arterial variant characterized by an absent anterior communicating artery with the two ACAs joined in their proximal segments (horizontal ...

This study evaluated anatomical variants in the carotid siphon and of the circle of Willis in patients with aneurysms. We performed a retrospective analysis of cerebral angiographies. The Control ...

The anastomosis in our patient appears to be a typical occipital knot, the persistent potential connection between the occipital artery and C1 vertebral artery posterior and superior to the posterior ...

Figure 2. The probability of AcomA occurrence according to the circle of Willis (COW) types. (A) Schematic illustrations of anterior communicating artery anatomic variations with aneurysm, (B) ...

In some individuals, the tuberothalamic artery is absent, and the AOP also supplies the anterior territory of the thalamus bilaterally. 4 16 The prevalence of the AOP is not well studied, but in a ...

Right coronary artery fistulas make up around 50–55% of coronary artery fistulas. Left anterior descending artery fistulas comprise around 35–40% of all cases.

Where the front part of the brain arterial network (the anterior cerebral artery, or A1) differs in left and right diameter ratio by up to 1.4, people have an 80 percent risk of developing aneurysms ...