Article Figures & Data
Figures
- Fig 1.
Images from a patient with a basilar tip aneurysm. A, Anteroposterior (AP) 2D DSA shows the measurement of dome diameter (white line) and neck width (black line). Dome-to-neck ratio for this 2D DSA image is 1.7. B, AP 3DRA from the same patient as in A shows dome diameter (gray line) and neck width (black line). Dome-to-neck ratio for this 3DRA image is 1.3.
- Fig 2.
Images from a patient with a superior hypophyseal aneurysm. A, Anteroposterior (AP) 2D DSA shows the measurement of dome diameter (white line) and neck width (black line). Dome-to-neck ratio for this 2D DSA image is 2.0. B, AP 3DRA from the same patient as in A shows dome diameter (gray line) and neck width (black line). Dome-to-neck ratio for this 3DRA image is 1.7.
- Fig 3.
Comparison of the distribution of dome-to-neck ratios in 2D DSA and 3DRA. Histogram shows the frequency of aneurysms with various dome-to-neck ratios. Frequencies are calculated for dome-to-neck intervals of 0.25; for example, ratios from 2.0 to 2.25 are grouped into a single frequency number. The black line denotes 3DRA measurements, whereas the white line denotes 2D DSA measurements. Vertical dashed lines indicate previously published thresholds for wide-neck aneurysms (black line, 1.5; white line, 2.0). Thus, aneurysms to the left of a vertical line would be considered wide-neck.
Tables
Dome-to-neck ratios in 2D DSA versus 3DRA
2D DSA 3DRA P Value Mean D/N (SD) 1.81 (0.55) 1.56 (0.48) <.0001* D/N <1.5, No. (%) 69 (33.7) 119 (58.0) <.0001† D/N <2.0, No. (%) 142 (69.3) 173 (84.4) .0004† Note:—D/N indicates dome-to-neck ratio; DSA, digital subtraction angiography; 3DRA, 3D rotational angiography.
* Paired t test, Wilcoxon signed ranked test.
† Pearson χ2 test.
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