An infundibular origin of an artery is defined by a tunnel-like to funnel-shaped vascular origin, which must be differentiated from an Aneurysm. On Angiography, this appears as a rounded or conical widening of the vessel diameter. The origin of the Posterior communicating artery is most commonly affected[^1]. Infundibular arterial origins can be found in 7-13 % of otherwise normal angiograms[^2] [^3] and are bilateral in 25 % of cases[^3].
Diagnostic criteria
The following criteria define an infundibular arterial origin[^5]:
Triangular shape
Mouth (widest part of the infundibulum) < 3 mm[^4]
Vessel at the apex
Imaging
The gold standard for imaging an infundibular arterial origin is digital subtraction angiography (DSA).
