Anterior communicating artery aneurysm with concomitant A2 segment triplication and anterior communicating artery fenestration, A rare case series on microsurgical treatment.

[INTRODUCTION AND IMPORTANCE] There are few cases of multiple simultaneous anterior communicating artery (AComA) aneurysms with A2 triplication and AComA duplication.

[CASES PRESENTATION] (1) A fenestrated AComA with a saccular aneurysm (neck diameter 9 mm; dome height 8 mm) projecting superiorly from the distal AComA branch, as well as an anomalous artery arising from the posterior surface of the same AComA. (2) A duplicate AComA with a saccular aneurysm (neck diameter of 5 mm; dome height of 9 mm) projecting superioposteriorly from the distal AComA branch, as well as an anomalous artery arising from the anterior surface of the same AComA was diagnosed. Both were treated by microsurgical titanium clip occlusion.

[CLINICAL DISCUSSION] Anatomical variations are believed to enhance the risk of anterior communicating artery (AComA) aneurysms, accounting for ~30% of all intracranial aneurysms. In such circumstances, the goal is to occlude the aneurysmal lesions safely while preserving the patency of other branches.

[CONCLUSION] AComA aneurysms accompanied by anomalous triplicated A2 and fenestrated AComA are rare and challenging. Such complex cases response best using microsurgery using titanium clip occlusion with durable favorable outcomes.