The anterior communicating artery (AComA) connects the two anterior cerebral arteries across the midline, forming the anterior apex of the circle of Willis. It is typically a short vessel 1-3 mm in diameter, though it is highly variable with a single dominant trunk, duplicated, or fenestrated forms described. Together with the anterior cerebral arteries it supplies the medial frontal lobes, corpus callosum genu, and anterior hypothalamus.
The anterior communicating artery complex is the single most common site of intracranial aneurysm, accounting for approximately 30% of all cerebral aneurysms. AComA aneurysms typically project anteriorly or superiorly and are associated with subfrontal subarachnoid haemorrhage patterns. They are notorious for producing cognitive and memory deficits after rupture or surgery due to their proximity to the septal perforating arteries supplying the basal forebrain structures including the columns of the fornix and anterior cingulate cortex.
Rupture of an anterior communicating artery aneurysm produces subarachnoid haemorrhage with subfrontal blood distribution, frequently causing anterior communicating artery syndrome with severe amnesia, confabulation, and personality change from injury to septal and basal forebrain perforating vessels.
Post-haemorrhagic vasospasm of the anterior cerebral and anterior communicating arteries after aneurysm rupture causes bilateral medial frontal lobe ischaemia, producing lower limb weakness and abulia, managed with triple-H therapy, nimodipine, and endovascular angioplasty.
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