Post Anterior Communicating Artery Anastomosis.

Area of Science:

• Neuroanatomy
• Cerebrovascular Anatomy
• Human Anatomy

Background:

• The anterior cerebral arteries (ACAs) are critical components of the brain's arterial supply.
• Variations in the Circle of Willis, including ACA anatomy, can impact cerebral blood flow and surgical planning.
• Previous descriptions of ACA variations include the azygos and bihemispheric ACA, often associated with A2 segment hypoplasia or aplasia.

Purpose of the Study:

• To describe a previously undocumented variant of the anterior cerebral artery (ACA) anatomy.
• To detail the specific location and characteristics of this ACA variant, distinguishing it from other known ACA anomalies.

Main Methods:

• Descriptive anatomical study.
• Detailed observation and documentation of a specific ACA variant.
• Comparison with established anatomical descriptions of ACA variations.

Main Results:

• A variant ACA configuration was identified where the A2 segment of one ACA anastomoses with the contralateral A2 segment distal to the anterior communicating artery.
• This anastomosis occurs without prior hypoplasia or aplasia of the A2 segments.
• The connection happens before the bifurcation of the ACA into the pericallosal and callosomarginal arteries.

Conclusions:

• This described ACA variant represents a distinct anatomical entity.
• Understanding this variation is important for neurovascular imaging and surgical interventions.
• Further research may explore the hemodynamic implications of this specific ACA anastomosis.