Flow Diversion for PComm Aneurysms

Anatomical Considerations and Treatment Challenges

The specific anatomical configuration of a PComm aneurysm with a moderate to large caliber PComm artery originating from the aneurysm presents unique challenges for flow diversion therapy 1

The American Heart Association/American Stroke Association guidelines explicitly state that for patients with aneurysmal subarachnoid hemorrhage from ruptured saccular aneurysms amenable to either primary coiling or clipping, stents or flow diverters should not be used due to higher risk of complications 2
For unruptured aneurysms, conventional treatment options should be considered first when technically feasible 1
Flow diversion should be reserved for cases where conventional treatment options are not feasible, such as fusiform/blister aneurysms or wide-neck aneurysms not amenable to clipping or primary coiling 2

For PComm aneurysms with a non-fetal but moderate to large caliber PComm artery, conventional surgical clipping may provide better results by allowing direct visualization and preservation of the PComm artery 3
If endovascular treatment is preferred, stent-assisted coiling may be more appropriate than flow diversion for this specific anatomical configuration 1
For younger patients, surgical clipping might be preferred over endovascular approaches to improve durability of treatment 2

Flow diversion in this anatomical configuration carries risks of thromboembolic complications due to required dual antiplatelet therapy 1
The risk-benefit ratio generally favors conventional treatment approaches over flow diversion when technically feasible 2, 1

If flow diversion is ultimately chosen, more frequent and longer-term follow-up imaging is necessary to monitor for incomplete occlusion and potential retreatment 2
Follow-up should include DSA at 6 months and then annually until complete occlusion is confirmed 4