The following findings of the signal loss suggest artefactual stenosis : (1) irregular margin, (2) low to ambiguous darkness as compared to background (3) the presence of bilaterality, (4) the absence of tandem arterial stenosis, (5) the location of the epicentre in genu (6) short length.
No looping i think
Never faced it so don’t know frankly
No stenosis
Artifact
FD- Artefactual stenosis at the level of ascending vertical and posterolateral genu of bilateral petrous ICA
The following findings of the signal loss suggest artefactual stenosis : (1) irregular margin, (2) low to ambiguous darkness as compared to background (3) the presence of bilaterality, (4) the absence of tandem arterial stenosis, (5) the location of the epicentre in genu (6) short length.
www.clinicalradiologyonline.net/article/S0009-9260%2815%2900424-9/references