Article Figures & Data
Figures
- Fig 1.
ISA is seen with CS in a 63-year-old woman following EN−mediated coiling of a carotid ophthalmic aneurysm. A, Unsubtracted digital angiography and B, corresponding thick-section FPCT identify the coil mass and stent crimp at the carotid siphon. C, CS on thin-section sagittal 3T-MRA reveals ISA on the outer (arrow) and inner (double arrows) vessel curve. D−I, Thin-section FPCT in sagittal (D and E) and axial (G and H) projections without (D and G) and with (E and H) dilute contrast identifies stent crimp and ISA corresponding to the CS. Schematic illustrations in sagittal (F) and axial (I) projections highlight the relative position of the stent (dashed red), parent vessel, and orphaned regions of ISA (yellow).
- Fig 2.
CS revealed in a 59-year-old woman with a wide-neck left carotid ophthalmic aneurysm. A−D, Lateral DSA (A), a 3D-RA reconstructed model (B), a postembolization lateral DSA (C), and an unsubtracted lateral digital angiogram show strut ends of the deployed 4.5 × 22 mm EN (D, arrows). E and F, Postembolization 3D-RA model (E) and FPCT reveal stent crimp at the siphon and an outer crescent region of ISA (F, arrow). G and H, Sagittal (G) and axial (H) 3T-MRA shows CS (arrow).
- Fig 3.
Schematic showing measured parent vessel parameters in the stented segment including the parent vessel diameter and the radius of curvature, which are functions of the underlying parent vessel geometry. A, The angle of the arc subtended by the deployed stent is measured independently and is a function of the location of the stent within the vessel. The stent-subtended arc angle is stent deployment location−dependent and is related to the stent landing zone with respect to the curved parent vessel. B, The stent-subtended angle can differ significantly even at a given location, depending on the relative stent position. C, 3D MPR of the 3D volumetric dataset with the axial and coronal orientations adjusted so as to enable the orthogonal visualization of the curve of the parent vessel, shown here with representative measurements. Red arrows demarcate the proximal and distal ends of the deployed EN.
Tables
- Table 1:
Univariate analysis of the dependence of ISA as detected by the presence of CS on 3T-MRA in intracranial ICA lesions
CS+ CS− P Value Patient count with ICA lesions 18 14 Vessel curvature radius (mm) 7.26 ± 2.0 9.8 ± 2.2 .002 Stent-subtended arc angle α 144 ± 32° 95.2 ± 42° <.001 Parent vessel diameter (mm) 4.06 ± 0.32 3.74 ± 0.54 .043 Stent length (22, 28, 37 mm) 16:1:1 10:4:0 .125 Aneurysm size (mm) 6.99 ± 5.2 7.99 ± 3.6 .546 Technique (jailing:sequential) 16:2 11:3 .427 - Table 2:
Multivariate analysis of the dependence of ISA on morphologic features in intracranial ICA lesions
χ2 P Value Vessel curvature radius 6.842 .009 Stent-subtended arc angle α 8.046 .005 Parent vessel diameter 4.062 .044 Total model 21.323 <.0001
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