Vascular
Wide-neck aneurysm
An intracranial aneurysm is usually called wide-necked when its neck is 4 mm or wider, or its dome-to-neck ratio is under 2. Wide necks make simple coiling harder.
The neck of an aneurysm is the opening between the sac and the parent artery. The most common definition of a wide-neck aneurysm is a neck of at least 4 mm, or a dome-to-neck ratio below 2.
Wide necks matter because coils placed in the sac can herniate into the parent artery. Options include balloon-assisted coiling, stent-assisted coiling, intrasaccular devices such as the WEB, flow diversion and microsurgical clipping.
Neck width is also a risk factor for recanalization after coiling, which is why it appears as an input in recanalization prediction models.
Tools that use this
- WEB Aneurysm Occlusion StudioPredict 6-month BOSS occlusion grade and adequate occlusion after Woven EndoBridge (WEB) treatment from aneurysm and device measurements.
- Aneurysm Recanalization StudioIndividualized risk of major recanalization after endovascular coiling over 12 to 48 months, with packing density what-ifs. C-index 0.83 on 3,530 aneurysms.
Related terms
Educational reference. Not medical advice and not for clinical decision-making.