Table 3. Braid deformation patterns (F2B2): foreshortening, fish-mouthing, braid bump deformation, and braid collapse.

	Type	Definition	Location	Grading	Comments
1	Foreshortening*	Movement on either or both ends of the FD towards the aneurysm neck of at least 5%	Proximal	Yes, no, cannot determine	Clearly visible compared with specific previous image, no semiquantitative estimate
			Distal
2	Fish-mouthing	Converging of focal FD end (cone shape) with more than 25% decrease of the outer FD diameter compared with expected continuation of FD shape	Proximal	None (<25%)†, 25%–50%, >50% of braid diameter, cannot determine	Involves just the proximal and/or distal tip
			Distal
3	Braid bump deformation	Braid bump or localized outward bulging of the FD mid-segment	Mid-segment (mid 50%)	Yes, no, cannot determine	Deformation exceeds proximal and/or distal braid diameter; should have dense rim
4	Braid collapse	Bottle-necked or cigar-shaped deformation diameter, decrease of >1/3 involving >1/3 of FD length	Either proximal or distal	Yes, no, cannot determine	Commonly noted, acutely requiring angioplasty or device removal; as opposed to fish-mouthing, involves a larger FD segment

^*Foreshortening is reported by comparing any follow up-image compared with the final image of the index procedure. Elongation (which accompanies negative remodeling) or foreshortening ±5% of total length.

^†Fish-mouthing of <25% cannot be reliably detected in typical standard of practice images with their different angulations of digital subtraction angiography (DSA) acquisitions and vessel anatomies.

FD, flow diverter.